Link with gettext library.
https://sourceforge.net/p/kcd/bugs/6/
--- Makefile.in.orig	2007-12-05 04:39:30.000000000 -0600
+++ Makefile.in	2019-11-04 06:36:36.000000000 -0600
@@ -60,7 +60,7 @@
 CXXCFLAGS	= $(CPPFLAGS) $(CXXFLAGS)
 
 LDFLAGS		= @LDFLAGS@
-LIBS		= @LIBINTL@ @LIBS@
+LIBS		= -lintl @LIBS@
 
 INSTALL		= @INSTALL@
 INSTALL_PROGRAM	= @INSTALL_PROGRAM@
