--- blackbox-0.74/src/Makefile.am	2016-07-10 15:50:14.000000000 +0000
+++ blackbox-0.74/src/Makefile.am	2019-09-04 18:12:16.632076013 +0000
@@ -68,6 +68,6 @@
 			  main.cc
 
 blackbox_DEPENDENCIES	= $(top_builddir)/lib/libbt.la
-blackbox_LDADD		= $(top_builddir)/lib/libbt.la
+blackbox_LDADD		= $(top_builddir)/lib/libbt.la $(XEXT_LIBS) $(X11_LIBS)
 
 AM_INSTALLCHECK_STD_OPTIONS_EXEMPT = blackbox
--- blackbox-0.74/util/Makefile.am	2016-07-10 16:00:48.000000000 +0000
+++ blackbox-0.74/util/Makefile.am	2019-09-04 18:19:03.761402153 +0000
@@ -34,10 +34,10 @@
 
 bsetroot_SOURCES	= bsetroot.cc bsetroot.hh
 bsetroot_DEPENDENCIES	= $(top_builddir)/lib/libbt.la
-bsetroot_LDADD		= $(top_builddir)/lib/libbt.la
+bsetroot_LDADD		= $(top_builddir)/lib/libbt.la $(XEXT_LIBS) $(X11_LIBS)
 
 bstyleconvert_SOURCES		= bstyleconvert.cc
 bstyleconvert_DEPENDENCIES	= $(top_builddir)/lib/libbt.la
-bstyleconvert_LDADD		= $(top_builddir)/lib/libbt.la
+bstyleconvert_LDADD		= $(top_builddir)/lib/libbt.la $(XEXT_LIBS) $(X11_LIBS)
 
 AM_INSTALLCHECK_STD_OPTIONS_EXEMPT = bsetroot bstyleconvert