--- fltk-1.3.5/configure.ac.orig	2019-04-09 19:15:01.127591888 +0200
+++ fltk-1.3.5/configure.ac	2019-04-09 19:18:55.769654056 +0200
@@ -274,7 +274,7 @@
 	    GLDSONAME="libfltk_gl.so.$FL_DSO_VERSION"
 	    IMGDSONAME="libfltk_images.so.$FL_DSO_VERSION"
 	    CAIRODSONAME="libfltk_cairo.so.$FL_DSO_VERSION"
-	    DSOCOMMAND="\$(CXX) \$(DSOFLAGS) -Wl,-soname,\$@ \$(LDLIBS) -shared -fPIC $DEBUGFLAG -o"
+	    DSOCOMMAND="\$(CXX) \$(DSOFLAGS) \$(LDFLAGS) -Wl,-soname,\$@ -shared -fPIC $DEBUGFLAG -o"
 
 	    # See if the compiler supports -fvisibility...
 	    AC_CACHE_CHECK([if the compiler supports -fvisibility],
--- fltk-1.3.3/src/Makefile.orig	2014-10-30 17:05:22.000000000 +0100
+++ fltk-1.3.3/src/Makefile	2014-11-18 22:26:21.624514932 +0100
@@ -258,7 +258,7 @@
 
 libfltk_s.a: $(OBJECTS)
 	echo $(DSOCOMMAND) libfltk_s.o ...
-	$(DSOCOMMAND) libfltk_s.o $(OBJECTS) $(IMAGELIBS)
+	$(DSOCOMMAND) libfltk_s.o $(OBJECTS) $(IMAGELIBS) $(LDLIBS)
 	echo $(LIBCOMMAND) libfltk_s.a libfltk_s.o
 	$(RM) $@
 	$(LIBCOMMAND) libfltk_s.a libfltk_s.o
@@ -294,7 +294,7 @@
 
 libfltk_forms_s.a: $(FLOBJECTS)
 	echo $(DSOCOMMAND) libfltk_forms_s.o ...
-	$(DSOCOMMAND) libfltk_forms_s.o $(FLOBJECTS)
+	$(DSOCOMMAND) libfltk_forms_s.o $(FLOBJECTS) $(LDLIBS)
 	echo $(LIBCOMMAND) libfltk_forms_s.a libfltk_forms_s.o
 	$(RM) $@
 	$(LIBCOMMAND) libfltk_forms_s.a libfltk_forms_s.o
@@ -330,7 +330,7 @@
 
 libfltk_gl_s.a: $(GLOBJECTS)
 	echo $(DSOCOMMAND) libfltk_gl_s.o ...
-	$(DSOCOMMAND) libfltk_gl_s.o $(GLOBJECTS)
+	$(DSOCOMMAND) libfltk_gl_s.o $(GLOBJECTS) $(GLDLIBS)
 	echo $(LIBCOMMAND) libfltk_gl_s.a libfltk_gl_s.o
 	$(RM) $@
 	$(LIBCOMMAND) libfltk_gl_s.a libfltk_gl_s.o
@@ -366,7 +366,7 @@
 
 libfltk_images_s.a: $(IMGOBJECTS)
 	echo $(DSOCOMMAND) libfltk_images_s.o ...
-	$(DSOCOMMAND) libfltk_images_s.o $(IMGOBJECTS)
+	$(DSOCOMMAND) libfltk_images_s.o $(IMGOBJECTS) $(LDLIBS)
 	echo $(LIBCOMMAND) libfltk_images_s.a libfltk_images_s.o
 	$(RM) $@
 	$(LIBCOMMAND) libfltk_images_s.a libfltk_images_s.o
--- fltk-1.3.5/cairo/Makefile.orig	2019-04-09 19:15:01.130925203 +0200
+++ fltk-1.3.5/cairo/Makefile	2019-04-09 19:19:17.109538448 +0200
@@ -42,7 +42,7 @@
 
 libfltk_cairo.so.$(FL_DSO_VERSION): $(CAIROOBJECTS) ../src/libfltk.so.$(FL_DSO_VERSION)
 	echo $(DSOCOMMAND) $@ ...
-	$(DSOCOMMAND) $@ $(CAIROOBJECTS) -L../src -lfltk $(CAIROLIBS)
+	$(DSOCOMMAND) $@ $(CAIROOBJECTS) -L../src -lfltk $(CAIROLIBS) -lcairo
 	$(RM) libfltk_cairo.so
 	$(LN) $(CAIRODSONAME) libfltk_cairo.so