Fix with newer babl (babl -> babl-0.1).

Index: configure
--- configure.orig
+++ configure
@@ -18893,12 +18893,12 @@ if test -n "$BABL_CFLAGS"; then
     pkg_cv_BABL_CFLAGS="$BABL_CFLAGS"
  elif test -n "$PKG_CONFIG"; then
     if test -n "$PKG_CONFIG" && \
-    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"babl\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "babl") 2>&5
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"babl-0.1\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "babl-0.1") 2>&5
   ac_status=$?
   $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
-  pkg_cv_BABL_CFLAGS=`$PKG_CONFIG --cflags "babl" 2>/dev/null`
+  pkg_cv_BABL_CFLAGS=`$PKG_CONFIG --cflags "babl-0.1" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes
 else
   pkg_failed=yes
@@ -18910,12 +18910,12 @@ if test -n "$BABL_LIBS"; then
     pkg_cv_BABL_LIBS="$BABL_LIBS"
  elif test -n "$PKG_CONFIG"; then
     if test -n "$PKG_CONFIG" && \
-    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"babl\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "babl") 2>&5
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"babl-0.1\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "babl-0.1") 2>&5
   ac_status=$?
   $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
-  pkg_cv_BABL_LIBS=`$PKG_CONFIG --libs "babl" 2>/dev/null`
+  pkg_cv_BABL_LIBS=`$PKG_CONFIG --libs "babl-0.1" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes
 else
   pkg_failed=yes
@@ -18936,9 +18936,9 @@ else
         _pkg_short_errors_supported=no
 fi
         if test $_pkg_short_errors_supported = yes; then
-	        BABL_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "babl" 2>&1`
+	        BABL_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "babl-0.1" 2>&1`
         else
-	        BABL_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "babl" 2>&1`
+	        BABL_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "babl-0.1" 2>&1`
         fi
 	# Put the nasty error message in config.log where it belongs
 	echo "$BABL_PKG_ERRORS" >&5
