Tuesday, August 11, 2009


There's another graphics library other than "gs" aka Graphical System which is an adaptation of wxWidgets otherwise known as wxErlang. If you have never tried using wxErlang to run your stuff then you might run into some problems.

Sadly, the documentation on this is pitifully little

For me, i got this error when i attempt to run the default wx libraries shipped with Erlang.

=ERROR REPORT==== 7-Jun-2009::12:17:09 ===
WX Failed loading "wxe_driver"@"/usr/local/lib/erlang/lib/wx-0.98.1/
** exception error: {load_driver,"dlopen(/usr/local/lib/erlang/lib/
wx-0.98.1/priv/i386-apple-darwin9.6.0/wxe_driver.so, 2): Symbol not
found: __ZN10wxGLCanvas20MacVisibilityChangedEv\n Referenced from: /
wxe_driver.so\n Expected in: flat namespace\n"}
in function wxe_server:start/0
in call from wx:new/1

If this is familiar to you, then i suggest you do the following
1. Read all of this
or if you are like me building wxErlang & BEAM emulator 5.7 from source
1. Download the wxErlang libraries from wxErlang website and unzip to dir wxMac-2.8.10
2. Change to that directory
3. Execute the following command:
./configure --with-opengl --enable-unicode --disable-shared --enable-graphics_ctx

4. Do the following in sequence:
make && make install
cd contrib/src/stc/
make && make install
Note that you might need to do a "sudo make install" if you use the default installation prefix which is /usr/local/{bin,lib, etc}
5. Assumed that you've download Erlang-OTP 13B source code and unzipped to a directory
6. Export the PATH variable such that the build directory to your wxErlang is right at the front of the PATH. e.g. export PATH=<wxErlang dir>:<rest of your path>
7. Build your erlang source code as per your preferences/needs as defined in the README

After all that is over, you should be able to launch your wxErlang programs.

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