diff -Nuar a/gtk/Makefile b/gtk/Makefile
--- a/gtk/Makefile	2016-04-27 06:04:12.000000000 +0200
+++ b/gtk/Makefile	2016-07-22 10:33:06.730040039 +0200
@@ -19,7 +19,6 @@
 	    -Wall \
 	    -Wno-parentheses \
 	    -Wno-write-strings \
-	    -g \
 	    -I/usr/X11R6/include \
 	    -fno-exceptions \
 	    -fno-rtti \
@@ -30,13 +29,14 @@
 	    -DDECIMAL_GLOBAL_ROUNDING_ACCESS_FUNCTIONS=1 \
 	    -DDECIMAL_GLOBAL_EXCEPTION_FLAGS=1 \
 	    -DDECIMAL_GLOBAL_EXCEPTION_FLAGS_ACCESS_FUNCTIONS=1 \
-	    -D_WCHAR_T_DEFINED
+	    -D_WCHAR_T_DEFINED \
+	    ${CXXFLAGS}
 
-LDFLAGS = -L/usr/X11R6/lib
+LDFLAGS := -L/usr/X11R6/lib ${LDFLAGS}
 ifeq "$(shell uname -s)" "Darwin"
 LIBS := gcc111libbid-mac-x64.a -lXmu $(shell pkg-config --libs gtk+-2.0)
 else
-LIBS := gcc111libbid-$(shell uname -m).a -lXmu $(shell pkg-config --libs gtk+-2.0)
+LIBS := gcc111libbid-$(shell uname -m).a -lXmu -lX11 -ldl -lpthread $(shell pkg-config --libs gtk+-2.0)
 endif
 
 ifeq "$(shell uname -s)" "Linux"