diff -rN -u old-pkg-config-0.21/main.c new-pkg-config-0.21/main.c
--- old-pkg-config-0.21/main.c	2006-08-16 19:54:56.000000000 +0200
+++ new-pkg-config-0.21/main.c	2006-10-30 23:45:21.000000000 +0100
@@ -500,6 +500,12 @@
 
             goto nextiter;
           }
+		  if (!pkgconfig_version_test(req))
+		  {
+			failed = TRUE;
+		  	verbose_error("%s requires version %s of pkgconfig, but version is " VERSION "\n",req->name,req->min_pkgconfig);
+			goto nextiter;
+		  }
 
         packages = g_slist_prepend (packages, req);
 
diff -rN -u old-pkg-config-0.21/parse.c new-pkg-config-0.21/parse.c
--- old-pkg-config-0.21/parse.c	2006-10-30 23:28:31.000000000 +0100
+++ new-pkg-config-0.21/parse.c	2006-10-30 23:48:48.000000000 +0100
@@ -248,6 +248,18 @@
 }
 
 static void
+parse_pkgconfig_version (Package *pkg, const char *str, const char *path)
+{
+  if (pkg->min_pkgconfig)
+    {
+      verbose_error ("pkgconfig_min_version field occurs twice in '%s'\n", path);
+
+      exit (1);
+    }
+  pkg->min_pkgconfig = trim_and_sub (pkg, str, path);
+}
+
+static void
 parse_description (Package *pkg, const char *str, const char *path)
 {
   if (pkg->description)
@@ -966,6 +978,8 @@
         parse_conflicts (pkg, p, path);
       else if (strcmp (tag, "URL") == 0)
         parse_url (pkg, p, path);
+	  else if (strcmp (tag, "pkgconfig_min_version") == 0)
+        parse_pkgconfig_version (pkg, p, path);
       else
         {
 	  /* we don't error out on unknown keywords because they may
diff -rN -u old-pkg-config-0.21/pkg.c new-pkg-config-0.21/pkg.c
--- old-pkg-config-0.21/pkg.c	2006-08-16 21:01:04.000000000 +0200
+++ new-pkg-config-0.21/pkg.c	2006-10-30 23:47:05.000000000 +0100
@@ -812,6 +812,11 @@
               exit (1);
             }
         }
+		  if (!pkgconfig_version_test(req))
+		  {
+		  	verbose_error("%s requires version %s of pkgconfig, but version is " VERSION "\n",req->name,req->min_pkgconfig);
+			exit(1);
+		  }
                                    
       iter = g_slist_next (iter);
     }
@@ -1387,6 +1392,14 @@
   return rpmvercmp (a, b);
 }
 
+
+gboolean pkgconfig_version_test(Package *pkg)
+{
+	if (pkg->min_pkgconfig == NULL)
+		return TRUE;
+	return version_test(GREATER_THAN_EQUAL, VERSION, pkg->min_pkgconfig);
+}
+
 gboolean
 version_test (ComparisonType comparison,
               const char *a,
diff -rN -u old-pkg-config-0.21/pkg.h new-pkg-config-0.21/pkg.h
--- old-pkg-config-0.21/pkg.h	2006-08-16 19:05:30.000000000 +0200
+++ new-pkg-config-0.21/pkg.h	2006-10-30 23:33:47.000000000 +0100
@@ -75,6 +75,7 @@
   int path_position; /* used to order packages by position in path of their .pc file, lower number means earlier in path */
   int libs_num; /* Number of times the "Libs" header has been seen */
   int libs_private_num;  /* Number of times the "Libs.private" header has been seen */
+  char *min_pkgconfig; /* minimum version of pkg-config */
 };
 
 Package *get_package               (const char *name);
@@ -101,6 +102,7 @@
 void add_search_dirs (const char *path, const char *separator);
 void package_init (void);
 int compare_versions (const char * a, const char *b);
+gboolean pkgconfig_version_test(Package *pkg);
 gboolean version_test (ComparisonType comparison,
                        const char *a,
                        const char *b);