Update buildenv

buildenv

@@ -52,7 +52,7 @@ zopen_install_caveats()
 {
 cat <<ZZ
 GNU Make has been installed as gmake under bin/ to avoid collision with z/OS /bin/make tool.
-If you prefer to use the make as is, source `zopen-config` with the option --override-zos-tools.
+If you prefer to use the make as is, source zopen-config with the option --override-zos-tools.
 Or add \$ZOPEN_ROOTFS/usr/local/altbin to your \$PATH.
 ZZ
 }