--- jbig2dec-0.9/configure.ac.orig	2006-07-27 01:57:39.000000000 +0200
+++ jbig2dec-0.9/configure.ac	2006-08-27 00:28:46.842054000 +0200
@@ -34,11 +34,12 @@
     LDFLAGS="$LDFLAGS -L$ac_cv_want_libpng/lib"
   fi
   dnl libpng requires pow() which may be in libm
-  AC_SEARCH_LIBS([pow], [m])
+  AC_CHECK_FUNC([pow], [M_LIB=], [AC_CHECK_LIB([m], [pow], [M_LIB="-lm"])])
   AC_CHECK_LIB([png], [png_check_sig], [
     AC_CHECK_LIB([z], [deflate], [
       AC_DEFINE(HAVE_LIBPNG, 1, [Define if libpng is available (-lpng)])
-      LIBS="-lpng -lz $LIBS"
+      PNG_LIBS="-lpng -lz $M_LIB"
+      AC_SUBST([PNG_LIBS])
       AC_LIBOBJ([jbig2_image_png])
       have_libpng="yes"
     ])