diff -Nuar a/gtk/Makefile b/gtk/Makefile
--- a/gtk/Makefile	2017-11-29 06:03:45.000000000 +0100
+++ b/gtk/Makefile	2017-12-10 14:01:06.715970583 +0100
@@ -15,11 +15,11 @@
 # along with this program; if not, see http://www.gnu.org/licenses/.
 ###############################################################################
 
-CFLAGS = -MMD \
+CFLAGS := -MMD \
 	 -Wall \
 	 -Wno-parentheses \
 	 -Wno-write-strings \
-	 -g \
+	 -Wno-error=narrowing \
 	 -I/usr/X11R6/include \
 	 $(shell pkg-config --cflags gtk+-2.0) \
 	 -DVERSION="\"$(shell cat ../VERSION)\"" \
@@ -27,21 +27,25 @@
 	 -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
-LIBS = gcc111libbid.a -lXmu $(shell pkg-config --libs gtk+-2.0)
+MYLDFLAGS = -L/usr/X11R6/lib
+LIBS = gcc111libbid.a -lX11 -ldl -lXmu $(shell pkg-config --libs gtk+-2.0)
 
 ifeq "$(shell uname -s)" "Linux"
-LDFLAGS += -Wl,--hash-style=both
+MYLDFLAGS += -Wl,--hash-style=both
 LIBS += -lpthread
 endif
 
+MYLDFLAGS += ${LDFLAGS}
+
 SRCS = shell_main.cc shell_skin.cc skins.cc keymap.cc shell_loadimage.cc \
 	shell_spool.cc core_main.cc core_commands1.cc core_commands2.cc \
 	core_commands3.cc core_commands4.cc core_commands5.cc \
@@ -83,7 +87,7 @@
 endif
 
 $(EXE): $(OBJS)
-	$(CXX) -o $(EXE) $(LDFLAGS) $(OBJS) $(LIBS)
+	$(CXX) -o $(EXE) $(MYLDFLAGS) $(OBJS) $(LIBS)
 
 $(SRCS) skin2cc.cc keymap2cc.cc skin2cc.conf: symlinks