diff --git a/configure.ac b/configure.ac
--- configure.ac
+++ configure.ac
@@ -2911,11 +2911,9 @@
       # fails to consult /usr/local/include by default.  This causes
       # mkmf.rb's have_header() to fail if the desired resource happens to be
       # installed in the /usr/local tree.
       RUBY_APPEND_OPTION(CCDLFLAGS, -fno-common)],
-    [bsdi*|cygwin*|msys*|mingw*|aix*|interix*], [ ],
-    [
-      RUBY_APPEND_OPTION(CCDLFLAGS, -fPIC)])
+    [ ])
   ], [
     AS_CASE(["$target_os"],
 	[hpux*],          [CCDLFLAGS="$CCDLFLAGS +Z"],
 	[solaris*|irix*], [CCDLFLAGS="$CCDLFLAGS -KPIC"],