configure: Improve error message when pkg-config is missing.

Until now, when pkg-config is missing, Autoconf emitted this error: error: possibly undefined macro: PKG_CHECK_MODULES This commit changes the message to: error: Please install pkg-config. This should be easier for users to interpret. Suggested-by: Ethan Jackson <[email protected]>
eyoung-father · Jul 13, 2011 · 2bc458b · 2bc458b
1 parent b9ec4ff
commit 2bc458b
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/m4/openvswitch.m4 b/m4/openvswitch.m4
@@ -92,8 +92,7 @@ AC_DEFUN([OVS_CHECK_OPENSSL],
      [ssl=check])
 
    if test "$ssl" != false; then
-       dnl Make sure that pkg-config is installed.
-       m4_pattern_forbid([PKG_CHECK_MODULES])
+       m4_ifndef([PKG_CHECK_MODULES], [m4_fatal([Please install pkg-config.])])
        PKG_CHECK_MODULES([SSL], [openssl], 
          [HAVE_OPENSSL=yes],
          [HAVE_OPENSSL=no