diff --git a/configure.in b/configure.in
index f2efd3da..af0f2ea0 100644
--- a/configure.in
+++ b/configure.in
@@ -18,6 +18,7 @@ AC_CANONICAL_TARGET([])
 dnl Checks for programs.
 AC_PROG_CC
 AC_PROG_CPP
+AC_PROG_EGREP
 AC_PROG_INSTALL
 AC_PROG_CC_STDC
 AC_SUBST(SHELL)