diff --git a/Makefile.in b/Makefile.in
index bd5199dc221..e50afa1a54c 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -43,6 +43,7 @@ LN_S=@LN_S@
 CFLAGS=@CFLAGS@
 C_SWITCH_X_SITE=@C_SWITCH_X_SITE@
 LD_SWITCH_X_SITE=@LD_SWITCH_X_SITE@
+YACC=@YACC@
 
 ### These help us choose version- and architecture-specific directories
 ### to install files in.
@@ -256,6 +257,7 @@ lib-src/Makefile: ${srcdir}/lib-src/Makefile.in Makefile
 	  -e 's|^\(VPATH *=\).*$$|\1'"${srcdir}"'/lib-src|'		\
 	  -e 's|^\(archlibdir *=\).*$$|\1'"${archlibdir}"'|'		\
 	  -e 's|^\(ALLOCA *=\).*$$|\1'"${ALLOCA}"'|'			\
+	  -e 's|^\(YACC *=\).*$$|\1'"${YACC}"'|'			\
 	  -e 's|^CC *=.*$$|CC='"${CC}"'|'				\
 	  -e 's|^CFLAGS *=.*$$|CFLAGS='"${CFLAGS}"'|' \
 	  -e 's|^C_SWITCH_SYSTEM *=.*$$|C_SWITCH_SYSTEM='"${C_SWITCH_SYSTEM}"'|' \
diff --git a/configure1.in b/configure1.in
index bf23d19013d..141e3f67fc0 100755
--- a/configure1.in
+++ b/configure1.in
@@ -929,6 +929,7 @@ dnl checks for programs
 AC_LN_S
 AC_PROG_CPP
 AC_PROG_INSTALL
+AC_PROG_YACC
 
 dnl checks for UNIX variants that set `DEFS'
 
diff --git a/lib-src/Makefile.in b/lib-src/Makefile.in
index f213dedea2e..0cdc6747c0f 100644
--- a/lib-src/Makefile.in
+++ b/lib-src/Makefile.in
@@ -19,6 +19,7 @@ CFLAGS=-g
 ALLOCA=
 C_SWITCH_SYSTEM=
 LOADLIBES=
+YACC=yacc
 version=version-not-set
 configname=configuration-name-not-set