added -fPIC for static library generation

configure.ac

@@ -55,6 +55,8 @@ AC_CHECK_DECLS([_finite], [], [], [[#include <float.h>]])
 if test "$ac_cv_have_decl_isnan" = "yes" ; then
    AC_TRY_LINK([#include <math.h>], [float f = 0.0; return isnan(f)], [], [LIBS="$LIBS -lm"])
 fi
+CPPFLAGS="$CPPFLAGS -fPIC"
+
 
 #check if .section.gnu.warning accepts long strings (for __warn_references)
 AC_LANG_PUSH([C])