Update from autoconf.

diff --git a/m4/search-libs.m4 b/m4/search-libs.m4
index ea3be9d..773da59 100644 (file)
--- a/m4/search-libs.m4
+++ b/m4/search-libs.m4
@@ -1,4 +1,4 @@
-#serial 3
+#serial 4
 
 dnl A replacement for autoconf's macro by the same name.  This version
 dnl uses `ac_lib' rather than `i' for the loop variable, but more importantly
@@ -8,36 +8,36 @@ dnl the `none required' case.
 dnl I hope it's only temporary while we wait for that version to be fixed.
 undefine([AC_SEARCH_LIBS])
 
-dnl AC_SEARCH_LIBS(FUNCTION, SEARCH-LIBS [, ACTION-IF-FOUND
-dnl            [, ACTION-IF-NOT-FOUND [, OTHER-LIBRARIES]]])
-dnl Search for a library defining FUNC, if it's not already available.
-
+# AC_SEARCH_LIBS(FUNCTION, SEARCH-LIBS,
+#                [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
+#                [OTHER-LIBRARIES])
+# --------------------------------------------------------
+# Search for a library defining FUNC, if it's not already available.
 AC_DEFUN(AC_SEARCH_LIBS,
 [
   AC_CACHE_CHECK([for library containing $1], [ac_cv_search_$1],
   [
-    ac_func_search_save_LIBS="$LIBS"
-    ac_cv_search_$1="no"
-    AC_TRY_LINK_FUNC([$1], [ac_cv_search_$1="none required"])
-    if test "$ac_cv_search_$1" = "no"; then
+    ac_func_search_save_LIBS=$LIBS
+    ac_cv_search_$1=no
+    AC_TRY_LINK_FUNC([$1], [ac_cv_search_$1='none required'])
+    if test "$ac_cv_search_$1" = no; then
       for ac_lib in $2; do
        LIBS="-l$ac_lib $5 $ac_func_search_save_LIBS"
-       AC_TRY_LINK_FUNC([$1],
-         [ac_cv_search_$1="-l$ac_lib"
-         break])
+       AC_TRY_LINK_FUNC([$1], [ac_cv_search_$1="-l$ac_lib"; break])
       done
     fi
-    LIBS="$ac_func_search_save_LIBS"
+    LIBS=$ac_func_search_save_LIBS
   ])
 
-  if test "$ac_cv_search_$1" = "no"; then :
+  if test "$ac_cv_search_$1" = no; then :
     $4
   else
-    if test "$ac_cv_search_$1" = "none required"; then :
+    if test "$ac_cv_search_$1" = 'none required'; then :
       $4
     else
       LIBS="$ac_cv_search_$1 $LIBS"
       $3
+      # m4_default([$3], [LIBS="$ac_cv_search_$1 $LIBS"])
     fi
   fi
 ])