Don't append option to $PKG-CONFIG if it's empty

diff --git a/configure.ac b/configure.ac
index 420ce5845d89c624114e363b2a2b7409136fdb78..a75bd5f5d83915c3d32ebec4ca2d2456655c000b 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -942,9 +942,11 @@ AC_ARG_VAR(PKG_CONFIG_PATH,
 PKG_PROG_PKG_CONFIG()
 
 dnl On some OS we need static linking 
-AS_IF([test "${SYS}" = "mingw32" -o "${SYS}" = "mingwce" -o "${SYS}" = "darwin" ],[
-       PKG_CONFIG="${PKG_CONFIG} --static"
-    ])
+       AS_IF([test -n "${PKG_CONFIG}" ],[
+             AS_IF([test "${SYS}" = "mingw32" -o "${SYS}" = "mingwce" -o "${SYS}" = "darwin" ],[
+                 PKG_CONFIG="${PKG_CONFIG} --static"
+             ])
+       ])
 
 
 dnl