diff --git a/configure.in b/configure.in
index 6d35fef..0258b42 100644
--- a/configure.in
+++ b/configure.in
@@ -97,7 +97,7 @@ x_ldflags="$X_LDFLAGS"
 x_libs="$X_LIBS $X_EXTRA_LIBS"
 X_OBJS="color.lo context.lo draw.lo grab.lo rend.lo rgba.lo ximage.lo"
   
-AC_CHECK_LIB(X11, XOpenDisplay, x_libs="$x_libs",
+AC_CHECK_LIB(X11, XOpenDisplay, x_libs="-lX11 $x_libs",
   AC_MSG_ERROR([ERROR: libX11 not found.]); exit,
   $X_LDFLAGS $X_EXTRA_LIBS $X_LIBS)
 AC_CHECK_LIB(Xext, XShmAttach, x_libs="-lXext $x_libs",
@@ -155,8 +155,7 @@ echo ""
 AC_MSG_ERROR([Fatal Error: no FreeType header files detected.])
 fi
 fi
-AC_CHECK_LIB(dl, dlopen, dlopen_libs=-ldl, [
-], -ldl)
+AC_CHECK_LIB(dl, dlopen, dlopen_libs=-ldl)
 
 EXTRA_LIBS="-L/usr/local/lib -L/usr/X11R6/lib"
 
@@ -263,7 +262,7 @@ AC_CHECK_LIB(ungif, DGifOpenFileName,
   gif_libs="-lungif"
   gif_ok=yes,
   gif_ok=no,
-  $EXTRA_LIBS)
+  $EXTRA_LIBS -lX11)
 if test "$gif_ok" = yes; then
   AC_MSG_CHECKING([for gif_lib.h])
   AC_TRY_CPP(
diff --git a/filters/filter_bumpmap.c b/filters/filter_bumpmap.c
index 13cba38..be3204f 100644
--- a/filters/filter_bumpmap.c
+++ b/filters/filter_bumpmap.c
@@ -227,7 +227,7 @@ bump_map_point(Imlib_Image im, pIFunctionParam par)
 	return im;
 }
 
-static void
+void
 init(struct imlib_filter_info *info)
 {
    char *filters[] = { "bump_map_point", "bump_map" };
@@ -243,13 +243,13 @@ init(struct imlib_filter_info *info)
    
 }
 
-static void
+void
 deinit()
 {
 	return;
 }
 
-static void *
+void *
 exec(char *filter, void *im, pIFunctionParam par)
 {
 	if (!strcmp(filter, "bump_map"))
diff --git a/filters/filter_colormod.c b/filters/filter_colormod.c
index db703ce..dbc49c8 100644
--- a/filters/filter_colormod.c
+++ b/filters/filter_colormod.c
@@ -168,7 +168,7 @@ colormod(Imlib_Image im, pIFunctionParam par)
 	return im;
 }
 
-static void
+void
 init(struct imlib_filter_info *info)
 {
    char *filters[] = { "colormod" };
@@ -184,13 +184,13 @@ init(struct imlib_filter_info *info)
    
 }
 
-static void
+void
 deinit()
 {
 	return;
 }
 
-static void *
+void *
 exec(char *filter, void *im, pIFunctionParam par)
 {
 	if (!strcmp(filter, "colormod"))
diff --git a/test/bmtest.c b/test/bmtest.c
index 17caabe..9ee0464 100644
--- a/test/bmtest.c
+++ b/test/bmtest.c
@@ -58,6 +58,7 @@ int main (int argc, char **argv)
    imlib_context_set_visual(vis);
    imlib_context_set_colormap(cm);
    imlib_context_set_drawable(win);
+   imlib_context_set_dither(1);
    imlib_context_set_blend(0);
    imlib_context_set_color_modifier(NULL);