--- /tmp/configure.ac	2008-08-14 01:13:37.000000000 +0200
+++ povray-3.7.0.beta.25b/configure.ac	2008-08-14 01:17:56.253198000 +0200
@@ -357,8 +357,6 @@
   AC_MSG_RESULT([yes])
   AX_CHECK_LIB([z], [$required_libz_version], [z], [zlibVersion], [zlib.h], [zlibVersion()], [$with_zlib])
   if test x"$ax_check_lib" != x"ok"; then
-    AC_MSG_ERROR([cannot find a suitable ZLIB library])
-  else
     pov_libz=ok
   fi
 fi
@@ -373,8 +371,6 @@
   AC_MSG_RESULT([yes])
   AX_CHECK_LIB([png], [$required_libpng_version], [png12 png], [png_get_libpng_ver], [png.h], [png_get_libpng_ver(NULL)], [$with_libpng])
   if test x"$ax_check_lib" != x"ok"; then
-    AC_MSG_ERROR([cannot find a suitable PNG library])
-  else
     pov_libpng=ok
   fi
 fi
@@ -390,11 +386,9 @@
   AC_MSG_RESULT([yes])
   AX_CHECK_LIBJPEG([$required_libjpeg_version], [$with_libjpeg])
   if test x"$ax_check_libjpeg" != x"ok"; then
-    AC_MSG_ERROR([cannot find a suitable JPEG library])
-  else
     # create jversion.h in builddir
     test -d "./source" || mkdir ./source
-    echo "#define JVERSION \"${ax_check_libjpeg_version}\"" > ./source/jversion.h
+    echo "#define JVERSION \"62\"" > ./source/jversion.h
     pov_libjpeg=ok
   fi
 fi
@@ -409,8 +403,6 @@
   AC_MSG_RESULT([yes])
   AX_CHECK_LIBTIFF([$required_libtiff_version], [$with_libtiff])
   if test x"$ax_check_libtiff" != x"ok"; then
-    AC_MSG_ERROR([cannot find a suitable TIFF library])
-  else
     pov_libtiff=ok
   fi
 fi