Network support added to Linux build.

configure

@@ -610,6 +610,8 @@ PKG_CONFIG
 allegro_LIBS
 allegro_CFLAGS
 ALLEGRO_CONFIG
+USE_NETWORKING_FALSE
+USE_NETWORKING_TRUE
 USE_WX_FALSE
 USE_WX_TRUE
 OS_LINUX_FALSE
@@ -724,6 +726,7 @@ enable_silent_rules
 enable_dependency_tracking
 enable_debug
 enable_wx
+enable_networking
 with_allegro_prefix
 with_allegro_exec_prefix
 enable_allegrotest
@@ -1388,6 +1391,7 @@ Optional Features:
                           speeds up one-time build
   --enable-debug          build debug executable
   --enable-wx             use wxWidgets GUI
+  --enable-networking     enable networking
   --disable-allegrotest       Do not try to compile and run a test LIBallegro program
   --disable-sdltest       Do not try to compile and run a test SDL program
 
@@ -4158,6 +4162,21 @@ else
 $as_echo "no" >&6; }
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to enable networking" >&5
+$as_echo_n "checking whether to enable networking... " >&6; }
+# Check whether --enable-networking was given.
+if test "${enable_networking+set}" = set; then :
+  enableval=$enable_networking;
+fi
+
+if test "$enable_networking" = "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
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for cpu" >&5
 $as_echo_n "checking for cpu... " >&6; }
 case "${host_cpu}" in
@@ -4221,6 +4240,14 @@ else
   USE_WX_FALSE=
 fi
 
+ if test "$enable_networking" = "yes"; then
+  USE_NETWORKING_TRUE=
+  USE_NETWORKING_FALSE='#'
+else
+  USE_NETWORKING_TRUE='#'
+  USE_NETWORKING_FALSE=
+fi
+
 
 if test "$enable_wx" != "yes"; then
    # Do not run test for Allegro with Win32/MinGW version, as binary builds have
@@ -5608,6 +5635,10 @@ if test -z "${USE_WX_TRUE}" && test -z "${USE_WX_FALSE}"; then
   as_fn_error $? "conditional \"USE_WX\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${USE_NETWORKING_TRUE}" && test -z "${USE_NETWORKING_FALSE}"; then
+  as_fn_error $? "conditional \"USE_NETWORKING\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 
 : "${CONFIG_STATUS=./config.status}"
 ac_write_fail=0