diff -Nuar a/gtk/Makefile b/gtk/Makefile
--- a/gtk/Makefile	2016-09-04 18:56:12.000000000 +0200
+++ b/gtk/Makefile	2016-09-24 16:13:34.824116365 +0200
@@ -15,11 +15,10 @@
 # along with this program; if not, see http://www.gnu.org/licenses/.
 ###############################################################################
 
-CFLAGS = -MMD \
+CFLAGS := -MMD \
 	 -Wall \
 	 -Wno-parentheses \
 	 -Wno-write-strings \
-	 -g \
 	 -I/usr/X11R6/include \
 	 $(shell pkg-config --cflags gtk+-2.0) \
 	 -DVERSION="\"$(shell cat ../VERSION)\"" \
@@ -27,14 +26,16 @@
 	 -DDECIMAL_GLOBAL_ROUNDING=1 \
 	 -DDECIMAL_GLOBAL_ROUNDING_ACCESS_FUNCTIONS=1 \
 	 -DDECIMAL_GLOBAL_EXCEPTION_FLAGS=1 \
-	 -DDECIMAL_GLOBAL_EXCEPTION_FLAGS_ACCESS_FUNCTIONS=1
+	 -DDECIMAL_GLOBAL_EXCEPTION_FLAGS_ACCESS_FUNCTIONS=1 \
+	 ${CFLAGS}
 
-CXXFLAGS = $(CFLAGS) \
+CXXFLAGS := $(CFLAGS) \
 	 -fno-exceptions \
 	 -fno-rtti \
-	 -D_WCHAR_T_DEFINED
+	 -D_WCHAR_T_DEFINED \
+	 ${CXXFLAGS}
 
-LDFLAGS = -L/usr/X11R6/lib
+LDFLAGS := -L/usr/X11R6/lib ${LDFLAGS}
-LIBS = gcc111libbid.a -lXmu $(shell pkg-config --libs gtk+-2.0)
+LIBS = gcc111libbid.a -lX11 -ldl -lXmu $(shell pkg-config --libs gtk+-2.0)
 
 ifeq "$(shell uname -s)" "Linux"