Fix building ocaml on FreeBSD

ocaml's Makefile is a GNU Makefile. FreeBSD's make is not GNU make, it's
bsd make. To execute GNU Makefile on FreeBSD one must use gmake.

Author: serpent7776

scripts/buildocaml.js

@@ -62,15 +62,16 @@ function build(config) {
     );
 
     if (config) {
+      var { make } = require("./config.js");
       cp.execSync(
         "./configure -flambda -prefix " +
           prefix +
-          " -no-ocamlbuild  -no-curses -no-graph -no-pthread -no-debugger && make clean",
+          ` -no-ocamlbuild  -no-curses -no-graph -no-pthread -no-debugger && ${make} clean`,
         { cwd: ocamlSrcDir, stdio: [0, 1, 2] }
       );
     }
 
-    cp.execSync("make -j9 world.opt && make install ", {
+    cp.execSync(`${make} -j9 world.opt && ${make} install `, {
       cwd: ocamlSrcDir,
       stdio: [0, 1, 2]
     });

scripts/config.js

@@ -3,7 +3,7 @@ var os = require('os')
 var os_type = os.type()
 
 var is_windows = !(os_type.indexOf('Windows') < 0)
-// var is_bsd = !(os_type.indexOf('BSD') < 0)
+var is_bsd = !(os_type.indexOf('BSD') < 0)
 
 exports.is_windows = is_windows
 var sys_extension;
@@ -17,7 +17,7 @@ switch (os.type()) {
 }
 
 exports.sys_extension  = sys_extension
-// var make = is_bsd ? 'gmake' : 'make'
-// exports.make  = make
+var make = is_bsd ? 'gmake' : 'make'
+exports.make  = make