diff --git a/Makefile.in b/Makefile.in
index ca54b6c..903d123 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,7 +1,7 @@
-# Makefile.in generated by automake 1.15.1 from Makefile.am.
+# Makefile.in generated by automake 1.15 from Makefile.am.
 # @configure_input@
 
-# Copyright (C) 1994-2017 Free Software Foundation, Inc.
+# Copyright (C) 1994-2014 Free Software Foundation, Inc.
 
 # This Makefile.in is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -308,6 +308,7 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
+runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
@@ -525,7 +526,7 @@ distdir: $(DISTFILES)
 	  ! -type d ! -perm -444 -exec $(install_sh) -c -m a+r {} {} \; \
 	|| chmod -R a+r "$(distdir)"
 dist-gzip: distdir
-	tardir=$(distdir) && $(am__tar) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).tar.gz
+	tardir=$(distdir) && $(am__tar) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).tar.gz
 	$(am__post_remove_distdir)
 
 dist-bzip2: distdir
@@ -551,7 +552,7 @@ dist-shar: distdir
 	@echo WARNING: "Support for shar distribution archives is" \
 	               "deprecated." >&2
 	@echo WARNING: "It will be removed altogether in Automake 2.0" >&2
-	shar $(distdir) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).shar.gz
+	shar $(distdir) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).shar.gz
 	$(am__post_remove_distdir)
 
 dist-zip: distdir
@@ -569,7 +570,7 @@ dist dist-all:
 distcheck: dist
 	case '$(DIST_ARCHIVES)' in \
 	*.tar.gz*) \
-	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).tar.gz | $(am__untar) ;;\
+	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).tar.gz | $(am__untar) ;;\
 	*.tar.bz2*) \
 	  bzip2 -dc $(distdir).tar.bz2 | $(am__untar) ;;\
 	*.tar.lz*) \
@@ -579,7 +580,7 @@ distcheck: dist
 	*.tar.Z*) \
 	  uncompress -c $(distdir).tar.Z | $(am__untar) ;;\
 	*.shar.gz*) \
-	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).shar.gz | unshar ;;\
+	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).shar.gz | unshar ;;\
 	*.zip*) \
 	  unzip $(distdir).zip ;;\
 	esac
diff --git a/aclocal.m4 b/aclocal.m4
index f6be9fe..925cb54 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1,6 +1,6 @@
-# generated automatically by aclocal 1.15.1 -*- Autoconf -*-
+# generated automatically by aclocal 1.15 -*- Autoconf -*-
 
-# Copyright (C) 1996-2017 Free Software Foundation, Inc.
+# Copyright (C) 1996-2014 Free Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -20,9 +20,9 @@ You have another version of autoconf.  It may work, but is not guaranteed to.
 If you have problems, you may need to regenerate the build system entirely.
 To do so, use the procedure documented by the package, typically 'autoreconf'.])])
 
-# pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
-# serial 12 (pkg-config-0.29.2)
-
+dnl pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
+dnl serial 11 (pkg-config-0.29)
+dnl
 dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
 dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
 dnl
@@ -63,7 +63,7 @@ dnl
 dnl See the "Since" comment for each macro you use to see what version
 dnl of the macros you require.
 m4_defun([PKG_PREREQ],
-[m4_define([PKG_MACROS_VERSION], [0.29.2])
+[m4_define([PKG_MACROS_VERSION], [0.29])
 m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
     [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
 ])dnl PKG_PREREQ
@@ -164,7 +164,7 @@ AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
 AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
 
 pkg_failed=no
-AC_MSG_CHECKING([for $2])
+AC_MSG_CHECKING([for $1])
 
 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
 _PKG_CONFIG([$1][_LIBS], [libs], [$2])
@@ -174,11 +174,11 @@ and $1[]_LIBS to avoid the need to call pkg-config.
 See the pkg-config man page for more details.])
 
 if test $pkg_failed = yes; then
-        AC_MSG_RESULT([no])
+   	AC_MSG_RESULT([no])
         _PKG_SHORT_ERRORS_SUPPORTED
         if test $_pkg_short_errors_supported = yes; then
 	        $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
-        else
+        else 
 	        $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
         fi
 	# Put the nasty error message in config.log where it belongs
@@ -195,7 +195,7 @@ installed software in a non-standard prefix.
 _PKG_TEXT])[]dnl
         ])
 elif test $pkg_failed = untried; then
-        AC_MSG_RESULT([no])
+     	AC_MSG_RESULT([no])
 	m4_default([$4], [AC_MSG_FAILURE(
 [The pkg-config script could not be found or is too old.  Make sure it
 is in your PATH or set the PKG_CONFIG environment variable to the full
@@ -1591,7 +1591,7 @@ AC_DEFUN([AM_PATH_WXCONFIG], [
 ])
 AC_DEFUN([AM_PATH_WXRC], [WXRC_CHECK([$1],[$2])])
 
-# Copyright (C) 2002-2017 Free Software Foundation, Inc.
+# Copyright (C) 2002-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1606,7 +1606,7 @@ AC_DEFUN([AM_AUTOMAKE_VERSION],
 [am__api_version='1.15'
 dnl Some users find AM_AUTOMAKE_VERSION and mistake it for a way to
 dnl require some minimum version.  Point them to the right macro.
-m4_if([$1], [1.15.1], [],
+m4_if([$1], [1.15], [],
       [AC_FATAL([Do not call $0, use AM_INIT_AUTOMAKE([$1]).])])dnl
 ])
 
@@ -1622,14 +1622,14 @@ m4_define([_AM_AUTOCONF_VERSION], [])
 # Call AM_AUTOMAKE_VERSION and AM_AUTOMAKE_VERSION so they can be traced.
 # This function is AC_REQUIREd by AM_INIT_AUTOMAKE.
 AC_DEFUN([AM_SET_CURRENT_AUTOMAKE_VERSION],
-[AM_AUTOMAKE_VERSION([1.15.1])dnl
+[AM_AUTOMAKE_VERSION([1.15])dnl
 m4_ifndef([AC_AUTOCONF_VERSION],
   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
 _AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])
 
 # AM_AUX_DIR_EXPAND                                         -*- Autoconf -*-
 
-# Copyright (C) 2001-2017 Free Software Foundation, Inc.
+# Copyright (C) 2001-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1681,7 +1681,7 @@ am_aux_dir=`cd "$ac_aux_dir" && pwd`
 
 # AM_CONDITIONAL                                            -*- Autoconf -*-
 
-# Copyright (C) 1997-2017 Free Software Foundation, Inc.
+# Copyright (C) 1997-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1712,7 +1712,7 @@ AC_CONFIG_COMMANDS_PRE(
 Usually this means the macro was only invoked conditionally.]])
 fi])])
 
-# Copyright (C) 1999-2017 Free Software Foundation, Inc.
+# Copyright (C) 1999-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1903,7 +1903,7 @@ _AM_SUBST_NOTMAKE([am__nodep])dnl
 
 # Generate code to set up dependency tracking.              -*- Autoconf -*-
 
-# Copyright (C) 1999-2017 Free Software Foundation, Inc.
+# Copyright (C) 1999-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1979,7 +1979,7 @@ AC_DEFUN([AM_OUTPUT_DEPENDENCY_COMMANDS],
 
 # Do all the work for Automake.                             -*- Autoconf -*-
 
-# Copyright (C) 1996-2017 Free Software Foundation, Inc.
+# Copyright (C) 1996-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2176,7 +2176,7 @@ for _am_header in $config_headers :; do
 done
 echo "timestamp for $_am_arg" >`AS_DIRNAME(["$_am_arg"])`/stamp-h[]$_am_stamp_count])
 
-# Copyright (C) 2001-2017 Free Software Foundation, Inc.
+# Copyright (C) 2001-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2197,7 +2197,7 @@ if test x"${install_sh+set}" != xset; then
 fi
 AC_SUBST([install_sh])])
 
-# Copyright (C) 2003-2017 Free Software Foundation, Inc.
+# Copyright (C) 2003-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2218,7 +2218,7 @@ AC_SUBST([am__leading_dot])])
 
 # Check to see how 'make' treats includes.	            -*- Autoconf -*-
 
-# Copyright (C) 2001-2017 Free Software Foundation, Inc.
+# Copyright (C) 2001-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2268,7 +2268,7 @@ rm -f confinc confmf
 
 # Fake the existence of programs that GNU maintainers use.  -*- Autoconf -*-
 
-# Copyright (C) 1997-2017 Free Software Foundation, Inc.
+# Copyright (C) 1997-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2307,7 +2307,7 @@ fi
 
 # Helper functions for option handling.                     -*- Autoconf -*-
 
-# Copyright (C) 2001-2017 Free Software Foundation, Inc.
+# Copyright (C) 2001-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2336,7 +2336,7 @@ AC_DEFUN([_AM_SET_OPTIONS],
 AC_DEFUN([_AM_IF_OPTION],
 [m4_ifset(_AM_MANGLE_OPTION([$1]), [$2], [$3])])
 
-# Copyright (C) 1999-2017 Free Software Foundation, Inc.
+# Copyright (C) 1999-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2383,7 +2383,7 @@ AC_LANG_POP([C])])
 # For backward compatibility.
 AC_DEFUN_ONCE([AM_PROG_CC_C_O], [AC_REQUIRE([AC_PROG_CC])])
 
-# Copyright (C) 2001-2017 Free Software Foundation, Inc.
+# Copyright (C) 2001-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2402,7 +2402,7 @@ AC_DEFUN([AM_RUN_LOG],
 
 # Check to make sure that the build environment is sane.    -*- Autoconf -*-
 
-# Copyright (C) 1996-2017 Free Software Foundation, Inc.
+# Copyright (C) 1996-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2483,7 +2483,7 @@ AC_CONFIG_COMMANDS_PRE(
 rm -f conftest.file
 ])
 
-# Copyright (C) 2009-2017 Free Software Foundation, Inc.
+# Copyright (C) 2009-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2543,7 +2543,7 @@ AC_SUBST([AM_BACKSLASH])dnl
 _AM_SUBST_NOTMAKE([AM_BACKSLASH])dnl
 ])
 
-# Copyright (C) 2001-2017 Free Software Foundation, Inc.
+# Copyright (C) 2001-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2571,7 +2571,7 @@ fi
 INSTALL_STRIP_PROGRAM="\$(install_sh) -c -s"
 AC_SUBST([INSTALL_STRIP_PROGRAM])])
 
-# Copyright (C) 2006-2017 Free Software Foundation, Inc.
+# Copyright (C) 2006-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -2590,7 +2590,7 @@ AC_DEFUN([AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE($@)])
 
 # Check how to create a tarball.                            -*- Autoconf -*-
 
-# Copyright (C) 2004-2017 Free Software Foundation, Inc.
+# Copyright (C) 2004-2014 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/configure b/configure
index c57343d..dd280fd 100755
--- a/configure
+++ b/configure
@@ -626,6 +626,8 @@ CPU_X86_64_FALSE
 CPU_X86_64_TRUE
 CPU_I386_FALSE
 CPU_I386_TRUE
+RELEASE_BUILD_FALSE
+RELEASE_BUILD_TRUE
 am__fastdepCXX_FALSE
 am__fastdepCXX_TRUE
 CXXDEPMODE
@@ -703,6 +705,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -727,6 +730,7 @@ ac_user_opts='
 enable_option_checking
 enable_silent_rules
 enable_dependency_tracking
+enable_release_build
 enable_debug
 enable_networking
 enable_alsa
@@ -794,6 +798,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1046,6 +1051,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1183,7 +1197,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1336,6 +1350,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -1380,6 +1395,7 @@ Optional Features:
                           do not reject slow dependency extractors
   --disable-dependency-tracking
                           speeds up one-time build
+  --enable-release-build  build for release
   --enable-debug          build debug executable
   --enable-networking     enable networking
   --enable-alsa           use ALSA for MIDI
@@ -4121,6 +4137,29 @@ fi
 
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build for release" >&5
+$as_echo_n "checking whether to build for release... " >&6; }
+# Check whether --enable-release_build was given.
+if test "${enable_release_build+set}" = set; then :
+  enableval=$enable_release_build;
+fi
+
+if test "$enable_release_build" = "yes"; then
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+else
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+ if test "$enable_release_build" = "yes"; then
+  RELEASE_BUILD_TRUE=
+  RELEASE_BUILD_FALSE='#'
+else
+  RELEASE_BUILD_TRUE='#'
+  RELEASE_BUILD_FALSE=
+fi
+
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to enable debugging" >&5
 $as_echo_n "checking whether to enable debugging... " >&6; }
 # Check whether --enable-debug was given.
@@ -4423,8 +4462,8 @@ fi
   if test "x$sdl_prefix$sdl_exec_prefix" = x ; then
 
 pkg_failed=no
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for sdl2 >= $min_sdl_version" >&5
-$as_echo_n "checking for sdl2 >= $min_sdl_version... " >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for SDL" >&5
+$as_echo_n "checking for SDL... " >&6; }
 
 if test -n "$SDL_CFLAGS"; then
     pkg_cv_SDL_CFLAGS="$SDL_CFLAGS"
@@ -4464,7 +4503,7 @@ fi
 
 
 if test $pkg_failed = yes; then
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+   	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
 
 if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
@@ -4482,7 +4521,7 @@ fi
 
 	sdl_pc=no
 elif test $pkg_failed = untried; then
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+     	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
 	sdl_pc=no
 else
@@ -5585,6 +5624,10 @@ if test -z "${am__fastdepCXX_TRUE}" && test -z "${am__fastdepCXX_FALSE}"; then
   as_fn_error $? "conditional \"am__fastdepCXX\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${RELEASE_BUILD_TRUE}" && test -z "${RELEASE_BUILD_FALSE}"; then
+  as_fn_error $? "conditional \"RELEASE_BUILD\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${CPU_I386_TRUE}" && test -z "${CPU_I386_FALSE}"; then
   as_fn_error $? "conditional \"CPU_I386\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
@@ -6755,3 +6798,4 @@ if test -n "$ac_unrecognized_opts" && test "$enable_option_checking" != no; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: unrecognized options: $ac_unrecognized_opts" >&5
 $as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2;}
 fi
+
diff --git a/configure.ac b/configure.ac
index 30b88bc..815aa33 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,6 +13,16 @@ AM_PROG_CC_C_O
 
 
 
+AC_MSG_CHECKING([whether to build for release])
+AC_ARG_ENABLE(release_build,
+	      AC_HELP_STRING([--enable-release-build], [build for release]))
+if test "$enable_release_build" = "yes"; then
+   AC_MSG_RESULT([yes])
+else
+   AC_MSG_RESULT([no])
+fi
+AM_CONDITIONAL(RELEASE_BUILD, [test "$enable_release_build" = "yes"])
+
 AC_MSG_CHECKING([whether to enable debugging])
 AC_ARG_ENABLE(debug,
 	      AC_HELP_STRING([--enable-debug], [build debug executable]))
@@ -139,4 +149,4 @@ AM_CONDITIONAL(OS_LINUX, [test "$build_linux" = "yes"])
 AM_CONDITIONAL(OS_WINDOWS, [test "$build_win" = "yes"])
 AM_CONDITIONAL(OS_MACOSX, [test "$build_macosx" = "yes"])
 
-AC_OUTPUT([Makefile src/Makefile])
\ No newline at end of file
+AC_OUTPUT([Makefile src/Makefile])
diff --git a/src/Makefile.am b/src/Makefile.am
index eccce04..dae893a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -68,17 +68,22 @@ pcem_CXXFLAGS += -DUSE_NETWORKING
 pcem_SOURCES += ne2000.c nethandler.c wx-hostconfig.c
 pcem_LDADD += slirp/libslirp.a
 endif
-
-if OS_MACOSX
-pcem_SOURCES += cdrom-ioctl-osx.c
-pcem_CFLAGS += -DPCEM_RENDER_WITH_TIMER -DPCEM_RENDER_TIMER_LOOP
-pcem_CXXFLAGS += -DPCEM_RENDER_WITH_TIMER -DPCEM_RENDER_TIMER_LOOP
-endif
-
-if OS_LINUX
-pcem_SOURCES += cdrom-ioctl-linux.c
-endif
-
-if !HAS_OFF64T
-pcem_CFLAGS += -Doff64_t=off_t -Dfopen64=fopen -Dfseeko64=fseek -Dftello64=ftell
-endif
\ No newline at end of file
+
+if OS_MACOSX
+pcem_SOURCES += cdrom-ioctl-osx.c
+pcem_CFLAGS += -DPCEM_RENDER_WITH_TIMER -DPCEM_RENDER_TIMER_LOOP
+pcem_CXXFLAGS += -DPCEM_RENDER_WITH_TIMER -DPCEM_RENDER_TIMER_LOOP
+endif
+
+if OS_LINUX
+pcem_SOURCES += cdrom-ioctl-linux.c
+endif
+
+if !HAS_OFF64T
+pcem_CFLAGS += -Doff64_t=off_t -Dfopen64=fopen -Dfseeko64=fseek -Dftello64=ftell
+endif
+
+if RELEASE_BUILD
+pcem_CFLAGS += -DRELEASE_BUILD
+pcem_CXXFLAGS += -DRELEASE_BUILD
+endif
diff --git a/src/Makefile.in b/src/Makefile.in
index 221de07..0233f65 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -1,7 +1,7 @@
-# Makefile.in generated by automake 1.15.1 from Makefile.am.
+# Makefile.in generated by automake 1.15 from Makefile.am.
 # @configure_input@
 
-# Copyright (C) 1994-2017 Free Software Foundation, Inc.
+# Copyright (C) 1994-2014 Free Software Foundation, Inc.
 
 # This Makefile.in is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -107,6 +107,8 @@ bin_PROGRAMS = pcem$(EXEEXT)
 @OS_MACOSX_TRUE@am__append_13 = -DPCEM_RENDER_WITH_TIMER -DPCEM_RENDER_TIMER_LOOP
 @OS_LINUX_TRUE@am__append_14 = cdrom-ioctl-linux.c
 @HAS_OFF64T_FALSE@am__append_15 = -Doff64_t=off_t -Dfopen64=fopen -Dfseeko64=fseek -Dftello64=ftell
+@RELEASE_BUILD_TRUE@am__append_16 = -DRELEASE_BUILD
+@RELEASE_BUILD_TRUE@am__append_17 = -DRELEASE_BUILD
 subdir = src
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/configure.ac
@@ -479,6 +481,7 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
+runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
@@ -545,9 +548,9 @@ pcem_SOURCES = 386.c 386_dynarec.c 386_dynarec_ops.c 808x.c \
 	$(am__append_9) $(am__append_11) $(am__append_14)
 pcem_CFLAGS = $(shell wx-config --cxxflags) $(shell sdl2-config \
 	--cflags) $(am__append_5) $(am__append_7) $(am__append_12) \
-	$(am__append_15)
+	$(am__append_15) $(am__append_16)
 pcem_CXXFLAGS = $(shell wx-config --cxxflags) $(shell sdl2-config \
-	--cflags) $(am__append_8) $(am__append_13)
+	--cflags) $(am__append_8) $(am__append_13) $(am__append_17)
 pcem_LDADD = @LIBS@ $(am__append_1) $(am__append_10)
 all: all-am