diff -Naurd old/configure.ac new/configure.ac
--- old/configure.ac	2019-03-03 12:10:38.826276038 +0500
+++ new/configure.ac	2019-03-03 21:02:30.456414852 +0500
@@ -133,17 +133,19 @@
   AC_DEFINE_UNQUOTED(PACKAGE_DATA_DIR, "${datadir}/${PACKAGE}")
 fi
 
-subdirs="util gsm gverb metadata"
+GSM_LIBS=-lgsm
+
+subdirs="util gverb metadata"
 
 AC_SUBST(subdirs)
 AC_SUBST(FFTW_LIBS)
 AC_SUBST(STATIC_FFTW_LIBS)
 AC_SUBST(FFTW_CFLAGS)
+AC_SUBST(GSM_LIBS)
 AC_SUBST(LIBTOOL)
 AC_OUTPUT([
 Makefile
 util/Makefile
-gsm/Makefile
 gverb/Makefile
 metadata/Makefile
 po/Makefile.in
diff -Naurd old/Makefile.am new/Makefile.am
--- old/Makefile.am	2016-10-17 14:05:54.000000000 +0500
+++ new/Makefile.am	2019-03-03 20:58:55.298862874 +0500
@@ -34,7 +34,7 @@
 	latency_1914.la xfade_1915.la sc4m_1916.la \
 	mbeq_1197.la pitch_scale_1193.la pitch_scale_1194.la imp_1199.la
 
-SUBDIRS = po util gsm gverb metadata
+SUBDIRS = po util gverb metadata
 
 # Wacky stuff to stop automake getting confused
 EXTRA_DIST = config.rpath  @top_srcdir@/*.xml @top_srcdir@/*.c @top_srcdir@/*.h \
@@ -73,7 +73,7 @@
 sc4_1882_la_LIBADD = -Lutil -ldb -lrms
 sc4m_1916_la_LIBADD = -Lutil -ldb -lrms
 se4_1883_la_LIBADD = -Lutil -ldb -lrms
-gsm_1215_la_LIBADD = gsm/libgsm.a
+gsm_1215_la_LIBADD = @GSM_LIBS@
 gverb_1216_la_LIBADD = -Lgverb -lgverb
 lcr_delay_1436_la_DEPENDENCIES = util/biquad.h