# Mysql gem install error on Mac OS X - 'ulong' undeclared error **URL:** \ **Category:** Rails\ **Created:** [April 12, 2008, 4:25am UTC](https://www.ruby-forum.com/t/mysql-gem-install-error-on-mac-os-x-ulong-undeclared-error/134565 "2008-04-12T04:25:39Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![greg](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/71c47a/32.png) [@greg](https://www.ruby-forum.com/u/greg)\ **Post date:** [April 12, 2008, 4:25am UTC](https://www.ruby-forum.com/t/mysql-gem-install-error-on-mac-os-x-ulong-undeclared-error/134565/1 "2008-04-12T04:25:39Z")
Hi, I can’t seem to install the mysql gem for Ruby (see errors below). I get an ‘ulong’ undeclared error. Can anyone assist? ============ERROR========================= Macintosh:mysql-2.7 greg$ sudo gem install mysql – –with-mysql-config=/usr/local/mysql/bin/mysql\_config Password: Building native extensions. This could take a while… ERROR: Error installing mysql: ERROR: Failed to build gem native extension. /opt/local/bin/ruby extconf.rb install mysql – –with-mysql-config=/usr/local/mysql/bin/mysql\_config checking for mysql\_ssl\_set()… yes checking for mysql.h… yes creating Makefile make gcc -I. -I. -I/opt/local/lib/ruby/1.8/i686-darwin8.10.1 -I. -DHAVE\_MYSQL\_SSL\_SET -DHAVE\_MYSQL\_H -I/opt/local/include -I/usr/local/mysql/include -Os -arch i386 -fno-common -fno-common -O2 -fno-common -pipe -fno-common -c mysql.c mysql.c: In function ‘Init\_mysql’: mysql.c:2015: error: ‘ulong’ undeclared (first use in this function) mysql.c:2015: error: (Each undeclared identifier is reported only once mysql.c:2015: error: for each function it appears in.) mysql.c:2015: error: syntax error before numeric constant mysql.c:2018: error: syntax error before numeric constant make: \*\*\* [mysql.o] Error 1 Gem files will remain installed in /opt/local/lib/ruby/gems/1.8/gems/mysql-2.7 for inspection. Results logged to /opt/local/lib/ruby/gems/1.8/gems/mysql-2.7/gem\_make.out ===========VERSION INFO========================== Macintosh:mysql-2.7 greg$ ruby --version ruby 1.8.6 (2007-03-13 patchlevel 0) [i686-darwin8.10.1] Macintosh:mysql-2.7 greg$ rails --version Rails 2.0.2 Macintosh:mysql-2.7 greg$ gem --version 1.1.0 =========MacBook Details============================ Model Name: MacBook Model Identifier: MacBook2,1 Processor Name: Intel Core 2 Duo Processor Speed: 2 GHz System Version: Mac OS X 10.5.2 (9C7010) Kernel Version: Darwin 9.2.2 Regards Greg ---
**Author:** ![greg](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/71c47a/32.png) [@greg](https://www.ruby-forum.com/u/greg)\ **Post date:** [April 12, 2008, 5:32am UTC](https://www.ruby-forum.com/t/mysql-gem-install-error-on-mac-os-x-ulong-undeclared-error/134565/2 "2008-04-12T05:32:16Z")
> I can’t seem to install the mysql gem for Ruby (see errors below). I get an > ‘ulong’ undeclared error. Can anyone assist? Hopefully this will help… [http://jlaine.net/2006/10/3/installing-ruby-mysql-driver-on-os-x](http://jlaine.net/2006/10/3/installing-ruby-mysql-driver-on-os-x) (read through the comments as well) ---
**Author:** ![greg](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/71c47a/32.png) [@greg](https://www.ruby-forum.com/u/greg)\ **Post date:** [September 23, 2010, 12:18am UTC](https://www.ruby-forum.com/t/mysql-gem-install-error-on-mac-os-x-ulong-undeclared-error/134565/3 "2010-09-23T00:18:22Z")
Philip H. wrote: > > I can’t seem to install the mysql gem for Ruby (see errors below). I get an > > ‘ulong’ undeclared error. Can anyone assist? > > Hopefully this will help… > > [http://jlaine.net/2006/10/3/installing-ruby-mysql-driver-on-os-x](http://jlaine.net/2006/10/3/installing-ruby-mysql-driver-on-os-x) > > (read through the comments as well) I have tried the solutions above and no success. Finally I decided to add #define ulong unsigned long to /usr/include/stdlib.h and tried installing again and voila, it worked ! Have also suggested this solution to many people and so far have not found any issues with it.