feat: build proect for restproxy

proxy_c/third-lib/libevent/m4/ntp_pkg_config.m4

@@ -0,0 +1,27 @@
+dnl NTP_PKG_CONFIG					-*- Autoconf -*-
+dnl
+dnl Look for pkg-config, which must be at least
+dnl $ntp_pkgconfig_min_version.
+dnl
+AC_DEFUN([NTP_PKG_CONFIG], [
+
+dnl lower the minimum version if you find an earlier one works
+ntp_pkgconfig_min_version='0.15.0'
+AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
+AS_UNSET([ac_cv_path_PKG_CONFIG])
+AS_UNSET([ac_cv_path_ac_pt_PKG_CONFIG])
+
+case "$PKG_CONFIG" in
+ /*)
+    AC_MSG_CHECKING([if pkg-config is at least version $ntp_pkgconfig_min_version])
+    if $PKG_CONFIG --atleast-pkgconfig-version $ntp_pkgconfig_min_version; then
+	AC_MSG_RESULT([yes])
+    else
+	AC_MSG_RESULT([no])
+	PKG_CONFIG=""
+    fi
+    ;;
+esac
+
+]) dnl NTP_PKG_CONFIG
+