write: Improve help text of --writer.

[paraslash.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 5960b0871ec7fc720bef13a90d9af5a58dd75e10..953a9d213e5402055d1c22407daae60a292675e0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -65,12 +65,17 @@ AC_DEFUN([LIB_SUBST_FLAGS], [
        AC_SUBST($1_ldflags)
 ])
 
+AC_USE_SYSTEM_EXTENSIONS
 AC_C_BIGENDIAN()
 
 AC_PATH_PROG([GENGETOPT], [gengetopt])
 test -z "$GENGETOPT" && AC_MSG_ERROR(
        [gengetopt is required to build this package])
 
+AC_PATH_PROG([M4], [m4])
+test -z "$M4" && AC_MSG_ERROR(
+       [The m4 macro processor is required to build this package])
+
 AC_PATH_PROG([HELP2MAN], [help2man])
 test -z "$HELP2MAN" && AC_MSG_ERROR(
        [help2man is required to build this package])
@@ -193,7 +198,6 @@ AC_SUBST(nsl_ldflags)
 ########################################################################### ucred
 AC_MSG_CHECKING(for struct ucred)
 AC_LINK_IFELSE([AC_LANG_PROGRAM([[
-       #define _GNU_SOURCE
        #include <sys/types.h>
        #include <sys/socket.h>
 ]], [[
@@ -1143,7 +1147,6 @@ audio format handlers: $audio_format_handlers
 filters: $(echo $filters)
 writers: $writers
 
-para_fade: $build_fade
 para_server: $build_server
 para_gui: $build_gui
 para_fade: $build_fade