--- a/configure.in
+++ b/configure.in
@@ -7948,18 +7948,17 @@ fi
 
 dnl ========================================================
 dnl =
 dnl = Static Build Options
 dnl =
 dnl ========================================================
 MOZ_ARG_HEADER(Static build options)
 
-if test "$OS_ARCH" = "WINNT"; then
-  GKMEDIAS_SHARED_LIBRARY=1
+if test -n "$GKMEDIAS_SHARED_LIBRARY"; then
   AC_DEFINE(GKMEDIAS_SHARED_LIBRARY)
 fi
 AC_SUBST(GKMEDIAS_SHARED_LIBRARY)
 
 if test -z "$MOZ_NATIVE_ZLIB"; then
 if test -n "$JS_SHARED_LIBRARY" -o "$GKMEDIAS_SHARED_LIBRARY"; then
   ZLIB_IN_MOZGLUE=1
   AC_DEFINE(ZLIB_IN_MOZGLUE)