--- a/configure	Wed Oct 31 12:16:39 2007 +0000
+++ b/configure	Sat Nov 03 12:01:35 2007 +0000
@@ -5052,9 +5052,9 @@
 
 
 
-{ echo "$as_me:$LINENO: checking for ucompress in -lz" >&5
-echo $ECHO_N "checking for ucompress in -lz... $ECHO_C" >&6; }
-if test "${ac_cv_lib_z_ucompress+set}" = set; then
+{ echo "$as_me:$LINENO: checking for uncompress in -lz" >&5
+echo $ECHO_N "checking for uncompress in -lz... $ECHO_C" >&6; }
+if test "${ac_cv_lib_z_uncompress+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5072,54 +5072,58 @@
 #ifdef __cplusplus
 extern "C"
 #endif
-char ucompress ();
-int
-main ()
-{
-return ucompress ();
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext conftest$ac_exeext
-if { (ac_try="$ac_link"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
-  (eval "$ac_link") 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
-	 test ! -s conftest.err
-       } && test -s conftest$ac_exeext &&
-       $as_test_x conftest$ac_exeext; then
-  ac_cv_lib_z_ucompress=yes
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-	ac_cv_lib_z_ucompress=no
+char uncompress ();
+int
+main ()
+{
+return uncompress ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext &&
+       $as_test_x conftest$ac_exeext; then
+  ac_cv_lib_z_uncompress=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_cv_lib_z_uncompress=no
 fi
 
 rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
       conftest$ac_exeext conftest.$ac_ext
 LIBS=$ac_check_lib_save_LIBS
 fi
-{ echo "$as_me:$LINENO: result: $ac_cv_lib_z_ucompress" >&5
-echo "${ECHO_T}$ac_cv_lib_z_ucompress" >&6; }
-if test $ac_cv_lib_z_ucompress = yes; then
+{ echo "$as_me:$LINENO: result: $ac_cv_lib_z_uncompress" >&5
+echo "${ECHO_T}$ac_cv_lib_z_uncompress" >&6; }
+if test $ac_cv_lib_z_uncompress = yes; then
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBZ 1
 _ACEOF
 
   LIBS="-lz $LIBS"
 
+else
+
+    echo "Zlib (libz.so) could not be found, but is required."
+    exit 1
 fi
 
 
@@ -5191,6 +5195,10 @@
 
   LIBS="-lGL $LIBS"
 
+else
+
+    echo "The OpenGL library (libGL.so) could not be found, but is required."
+    exit 1
 fi