--- psiconv/trunk/configure.in	1999/10/13 16:08:59	16
+++ psiconv/trunk/configure.in	1999/10/27 14:29:40	19
@@ -139,4 +139,56 @@
 esac],[rtfdocs=false])
 AM_CONDITIONAL(RTFDOCS,test x$rtfdocs = xtrue)
 
+dnl This is stolen from gnome-libs-1.0.14
+AC_ARG_ENABLE(compile-warnings, 
+[  --enable-compile-warnings=[no/minimum/yes]       Turn on compiler warnings.],
+,enable_compile_warnings=minimum)
+
+AC_MSG_CHECKING(what warning flags to pass to the C compiler)
+warnCFLAGS=
+if test "x$GCC" != xyes; then
+  enable_compile_warnings=no
+fi
+if test "x$enable_compile_warnings" != "xno"; then
+  if test "x$GCC" = "xyes"; then
+    case " $CFLAGS " in
+    *[\ \	]-Wall[\ \	]*) ;;
+    *) warnCFLAGS="-Wall -Wunused" ;;
+    esac
+
+    ## -W is not all that useful.  And it cannot be controlled
+    ## with individual -Wno-xxx flags, unlike -Wall
+    if test "x$enable_compile_warnings" = "xyes"; then
+      warnCFLAGS="$warnCFLAGS -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith"
+    fi
+  fi
+fi
+AC_MSG_RESULT($warnCFLAGS)
+
+AC_ARG_ENABLE(iso-c,
+  [  --enable-iso-c          Try to warn if code is not ISO C ],,
+  enable_iso_c=no)
+
+AC_MSG_CHECKING(what language compliance flags to pass to the C compiler)
+complCFLAGS=
+if test "x$enable_iso_c" != "xno"; then
+  if test "x$GCC" = "xyes"; then
+    case " $CFLAGS " in
+    *[\ \	]-ansi[\ \	]*) ;;
+    *) complCFLAGS="$complCFLAGS -ansi" ;;
+    esac
+
+    case " $CFLAGS " in
+    *[\ \	]-pedantic[\ \	]*) ;;
+    *) complCFLAGS="$complCFLAGS -pedantic" ;;
+    esac
+  fi
+fi
+AC_MSG_RESULT($complCFLAGS)
+if test "x$cflags_set" != "xyes"; then
+  CFLAGS="$CFLAGS $warnCFLAGS $complCFLAGS"
+  cflags_set=yes
+  AC_SUBST(cflags_set)
+fi
+
 AC_OUTPUT([Makefile compat/Makefile lib/Makefile psiconv/Makefile lib/general.h formats/Makefile docs/Makefile])