--- src/libcw/Makefile.in.orig	2023-11-18 13:32:32
+++ src/libcw/Makefile.in	2024-05-30 19:50:10
@@ -522,7 +522,7 @@
 #
 # $(LIBCW_NDEBUG) activates asserts in base libcw for dev builds, and
 # deactivates asserts in base libcw for regular builds.
-libcw_la_CPPFLAGS = $(AM_CPPFLAGS) $(LIBCW_NDEBUG) -I${top_srcdir}/src/
+libcw_la_CPPFLAGS = $(AM_CPPFLAGS) $(LIBCW_NDEBUG) -I${top_srcdir}/src/ -DLIBDIR=\"$(libdir)\"
 libcw_includedir = $(includedir)
 libcw_include_HEADERS = libcw.h libcw2.h libcw_debug.h
 
@@ -546,7 +546,7 @@
 #
 # $(LIBCW_NDEBUG) activates asserts in base libcw for dev builds, and
 # deactivates asserts in base libcw for regular builds.
-libcw_test_la_CPPFLAGS = $(AM_CPPFLAGS) $(LIBCW_NDEBUG) -DLIBCW_UNIT_TESTS
+libcw_test_la_CPPFLAGS = $(AM_CPPFLAGS) $(LIBCW_NDEBUG) -DLIBCW_UNIT_TESTS -DLIBDIR=\"$(libdir)\"
 
 # target: libcw.pc
 pkgconfigdir = $(libdir)/pkgconfig