--- src/httpd/configure.orig	2018-04-20 00:31:00 UTC
+++ src/httpd/configure
@@ -115,7 +115,7 @@ if [ "${GROONGA_HTTPD_WITH_MRUBY}" = "yes" -a \
     --with-ngx-src-root=${nginx_directory} \
     --with-mruby-incdir="${mruby_directory}/src ${mruby_directory}/include" \
     --with-mruby-libdir=${libmruby_directory}
-  make generate_gems_config
+  gmake generate_gems_config
   configure_args="${configure_args} --add-module=${nginx_mruby_directory}/dependence/ngx_devel_kit"
   configure_args="${configure_args} --add-module=${nginx_mruby_directory_in_build_directory}"
 fi