--- a/configure.in
+++ b/configure.in
@@ -29,6 +29,8 @@ AC_PREREQ([2.69])
 
 AC_CANONICAL_HOST
 
+AC_PROG_EGREP
+
 AC_ARG_ENABLE(unix,[  --enable-unix           build all Unix emulators])
 AC_ARG_ENABLE(windows,[  --enable-windows        build all Windows emulators])
 
--- a/lib/configure.in
+++ b/lib/configure.in
@@ -31,6 +31,7 @@ dnl Checks for programs.
 AC_PROG_INSTALL
 AC_PROG_CC
 AC_PROG_RANLIB
+AC_PROG_EGREP
 AC_CHECK_TOOLS(AR, [ar])
 
 dnl Figure out what sort of host this is.