From: David Masover <ninja@...>
Date: 2008-05-28T17:14:23+09:00
Subject: ruby-opengl gem uses ruby1.9, even from gem1.8

This is on an Ubuntu Hardy system, on x86_64. Both Ruby 1.8 and 1.9 are 
installed.

I was tracking down the lack of ruby.h, which surprised me, as ruby1.8-dev is 
installed. Scrolling up even further, though, and something just seems wrong 
about these three lines:

rake RUBYARCHDIR=/var/lib/gems/1.8/gems/ruby-opengl-0.60.0/lib 
RUBYLIBDIR=/var/lib/gems/1.8/gems/ruby-opengl-0.60.0/lib extension
/usr/bin/ruby1.9 mkrf_conf.rb
(in /var/lib/gems/1.8/gems/ruby-opengl-0.60.0)

Why is ruby1.9 being used to run mkrf_conf.rb? I am using a 1.8 gem -- as you 
can see, it's trying to install in a 1.8 path, and:

$ head -1 `which gem`
#! /usr/bin/ruby1.8
$ head -1 `which gem1.9`
#!/usr/bin/ruby1.9

I am sure I was using 'gem', and not 'gem1.9'.

Full log from /var/lib/gems/1.8/gems/ruby-opengl-0.60.0/gem_make.out:

rake RUBYARCHDIR=/var/lib/gems/1.8/gems/ruby-opengl-0.60.0/lib 
RUBYLIBDIR=/var/lib/gems/1.8/gems/ruby-opengl-0.60.0/lib extension
/usr/bin/ruby1.9 mkrf_conf.rb
(in /var/lib/gems/1.8/gems/ruby-opengl-0.60.0)
rake
cc  -fPIC -fno-strict-aliasing -g  -fPIC    -Wall -DRUBY_VERSION=190  -I/usr/include/ruby-1.9.0 -I/usr/include/ruby-1.9.0/x86_64-linux -I/usr/lib/ruby/1.9.0/x86_64-linux -I/usr/local/lib/site_ruby/1.9.0 -I. -c 
gl.c
(in /var/lib/gems/1.8/gems/ruby-opengl-0.60.0/ext/gl)
In file included from gl.c:18:
../common/common.h:25:18: error: ruby.h: No such file or directory
In file included from ../common/common.h:51,
                 from gl.c:18:
../common/gl-error.h:16: warning: parameter names (without types) in function 
declaration
../common/gl-error.h:18: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ 
or ‘__attribute__’ before ‘error_checking’
../common/gl-error.h:19: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ 
or ‘__attribute__’ before ‘inside_begin_end’
In file included from ../common/common.h:54,
                 from gl.c:18:
../common/conv.h: In function ‘num2double’:
../common/conv.h:55: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:55: warning: implicit declaration of function ‘FIXNUM_P’
../common/conv.h:55: warning: implicit declaration of function ‘FIX2LONG’
../common/conv.h:55: warning: implicit declaration of function ‘TYPE’
../common/conv.h:55: error: ‘T_FLOAT’ undeclared (first use in this function)
../common/conv.h:55: error: (Each undeclared identifier is reported only once
../common/conv.h:55: error: for each function it appears in.)
../common/conv.h:55: warning: implicit declaration of function ‘RFLOAT’
../common/conv.h:55: error: invalid type argument of ‘->’
../common/conv.h:55: error: ‘Qtrue’ undeclared (first use in this function)
../common/conv.h:55: error: ‘Qfalse’ undeclared (first use in this function)
../common/conv.h:55: error: ‘Qnil’ undeclared (first use in this function)
../common/conv.h:55: warning: implicit declaration of function ‘rb_num2dbl’
../common/conv.h: In function ‘num2int’:
../common/conv.h:62: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:62: error: ‘T_FLOAT’ undeclared (first use in this function)
../common/conv.h:62: error: invalid type argument of ‘->’
../common/conv.h:62: error: ‘Qtrue’ undeclared (first use in this function)
../common/conv.h:62: error: ‘Qfalse’ undeclared (first use in this function)
../common/conv.h:62: error: ‘Qnil’ undeclared (first use in this function)
../common/conv.h:62: warning: implicit declaration of function ‘NUM2LONG’
../common/conv.h: In function ‘num2uint’:
../common/conv.h:63: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:63: warning: implicit declaration of function ‘FIX2ULONG’
../common/conv.h:63: error: ‘T_FLOAT’ undeclared (first use in this function)
../common/conv.h:63: error: invalid type argument of ‘->’
../common/conv.h:63: error: ‘Qtrue’ undeclared (first use in this function)
../common/conv.h:63: error: ‘Qfalse’ undeclared (first use in this function)
../common/conv.h:63: error: ‘Qnil’ undeclared (first use in this function)
../common/conv.h:63: warning: implicit declaration of function ‘NUM2ULONG’
../common/conv.h: At top level:
../common/conv.h:114: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ 
before ‘cond_GLBOOL2RUBY’
../common/conv.h:115: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ 
before ‘cond_GLBOOL2RUBY_U’
../common/conv.h:116: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ 
before ‘cond_GLBOOL2RUBY_LL’
../common/conv.h:117: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ 
before ‘cond_GLBOOL2RUBY_ULL’
../common/conv.h:118: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ 
before ‘cond_GLBOOL2RUBY_F’
../common/conv.h:119: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ 
before ‘cond_GLBOOL2RUBY_D’
../common/conv.h: In function ‘ary2cint’:
../common/conv.h:142: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:142: warning: implicit declaration of function ‘RARRAY’
../common/conv.h:142: warning: implicit declaration of function ‘rb_Array’
../common/conv.h:142: warning: assignment makes pointer from integer without a 
cast
../common/conv.h:142: error: dereferencing pointer to incomplete type
../common/conv.h:142: error: dereferencing pointer to incomplete type
../common/conv.h:142: error: dereferencing pointer to incomplete type
../common/conv.h:142: warning: implicit declaration of function ‘rb_ary_entry’
../common/conv.h:142: error: ‘VALUE’ undeclared (first use in this function)
../common/conv.h:142: error: expected ‘)’ before ‘ary’
../common/conv.h: In function ‘ary2cuint’:
../common/conv.h:143: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:143: warning: assignment makes pointer from integer without a 
cast
../common/conv.h:143: error: dereferencing pointer to incomplete type
../common/conv.h:143: error: dereferencing pointer to incomplete type
../common/conv.h:143: error: dereferencing pointer to incomplete type
../common/conv.h:143: error: ‘VALUE’ undeclared (first use in this function)
../common/conv.h:143: error: expected ‘)’ before ‘ary’
../common/conv.h: In function ‘ary2cbyte’:
../common/conv.h:144: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:144: warning: assignment makes pointer from integer without a 
cast
../common/conv.h:144: error: dereferencing pointer to incomplete type
../common/conv.h:144: error: dereferencing pointer to incomplete type
../common/conv.h:144: error: dereferencing pointer to incomplete type
../common/conv.h:144: error: ‘VALUE’ undeclared (first use in this function)
../common/conv.h:144: error: expected ‘)’ before ‘ary’
../common/conv.h: In function ‘ary2cubyte’:
../common/conv.h:145: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:145: warning: assignment makes pointer from integer without a 
cast
../common/conv.h:145: error: dereferencing pointer to incomplete type
../common/conv.h:145: error: dereferencing pointer to incomplete type
../common/conv.h:145: error: dereferencing pointer to incomplete type
../common/conv.h:145: error: ‘VALUE’ undeclared (first use in this function)
../common/conv.h:145: error: expected ‘)’ before ‘ary’
../common/conv.h: In function ‘ary2cshort’:
../common/conv.h:146: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:146: warning: assignment makes pointer from integer without a 
cast
../common/conv.h:146: error: dereferencing pointer to incomplete type
../common/conv.h:146: error: dereferencing pointer to incomplete type
../common/conv.h:146: error: dereferencing pointer to incomplete type
../common/conv.h:146: error: ‘VALUE’ undeclared (first use in this function)
../common/conv.h:146: error: expected ‘)’ before ‘ary’
../common/conv.h: In function ‘ary2cushort’:
../common/conv.h:147: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:147: warning: assignment makes pointer from integer without a 
cast
../common/conv.h:147: error: dereferencing pointer to incomplete type
../common/conv.h:147: error: dereferencing pointer to incomplete type
../common/conv.h:147: error: dereferencing pointer to incomplete type
../common/conv.h:147: error: ‘VALUE’ undeclared (first use in this function)
../common/conv.h:147: error: expected ‘)’ before ‘ary’
../common/conv.h: In function ‘ary2cboolean’:
../common/conv.h:148: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:148: warning: assignment makes pointer from integer without a 
cast
../common/conv.h:148: error: dereferencing pointer to incomplete type
../common/conv.h:148: error: dereferencing pointer to incomplete type
../common/conv.h:148: error: dereferencing pointer to incomplete type
../common/conv.h:148: error: ‘VALUE’ undeclared (first use in this function)
../common/conv.h:148: error: expected ‘)’ before ‘ary’
../common/conv.h: In function ‘ary2cfloat’:
../common/conv.h:149: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:149: warning: assignment makes pointer from integer without a 
cast
../common/conv.h:149: error: dereferencing pointer to incomplete type
../common/conv.h:149: error: dereferencing pointer to incomplete type
../common/conv.h:149: error: dereferencing pointer to incomplete type
../common/conv.h:149: error: ‘VALUE’ undeclared (first use in this function)
../common/conv.h:149: error: expected ‘)’ before ‘ary’
../common/conv.h: In function ‘ary2cdouble’:
../common/conv.h:150: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:150: warning: assignment makes pointer from integer without a 
cast
../common/conv.h:150: error: dereferencing pointer to incomplete type
../common/conv.h:150: error: dereferencing pointer to incomplete type
../common/conv.h:150: error: dereferencing pointer to incomplete type
../common/conv.h:150: error: ‘VALUE’ undeclared (first use in this function)
../common/conv.h:150: error: expected ‘)’ before ‘ary’
../common/conv.h: In function ‘ary2cmatdouble’:
../common/conv.h:176: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:176: warning: implicit declaration of function ‘rb_funcall’
../common/conv.h:176: warning: implicit declaration of function ‘rb_intern’
../common/conv.h:176: error: invalid type argument of ‘->’
../common/conv.h:176: warning: implicit declaration of function ‘rb_raise’
../common/conv.h:176: error: ‘rb_eArgError’ undeclared (first use in this 
function)
../common/conv.h: In function ‘ary2cmatfloat’:
../common/conv.h:177: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:177: error: invalid type argument of ‘->’
../common/conv.h:177: error: ‘rb_eArgError’ undeclared (first use in this 
function)
../common/conv.h: In function ‘ary2cmatdoublecount’:
../common/conv.h:200: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:200: warning: implicit declaration of function ‘RARRAY_LEN’
../common/conv.h:200: warning: implicit declaration of function ‘xfree’
../common/conv.h:200: error: ‘rb_eArgError’ undeclared (first use in this 
function)
../common/conv.h: In function ‘ary2cmatfloatcount’:
../common/conv.h:201: error: expected declaration specifiers before ‘VALUE’
../common/conv.h:201: error: ‘rb_eArgError’ undeclared (first use in this 
function)
In file included from gl.c:18:
../common/common.h: At top level:
../common/common.h:81: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ 
before ‘cProc’
../common/common.h: In function ‘glformat_size’:
../common/common.h:173: error: ‘rb_eArgError’ undeclared (first use in this 
function)
../common/common.h: In function ‘gltype_glformat_unit_size’:
../common/common.h:231: error: ‘rb_eArgError’ undeclared (first use in this 
function)
../common/common.h: In function ‘get_uniform_size’:
../common/common.h:316: error: ‘rb_eTypeError’ undeclared (first use in this 
function)
../common/common.h: At top level:
../common/common.h:338: error: expected declaration specifiers or ‘...’ 
before ‘VALUE’
../common/common.h: In function ‘CheckDataSize’:
../common/common.h:344: warning: implicit declaration of 
function ‘RSTRING_LEN’
../common/common.h:344: error: ‘data’ undeclared (first use in this function)
../common/common.h:345: error: ‘rb_eArgError’ undeclared (first use in this 
function)
../common/common.h: At top level:
../common/common.h:349: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ 
or ‘__attribute__’ before ‘allocate_buffer_with_string’
../common/common.h: In function ‘load_gl_function’:
../common/common.h:390: error: ‘rb_eNotImpError’ undeclared (first use in this 
function)
../common/common.h: At top level:
../common/common.h:395: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ 
or ‘__attribute__’ before ‘pack_array_or_pass_string’
gl.c:20: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ 
before ‘module’
gl.c:22: warning: parameter names (without types) in function declaration
gl.c:23: warning: parameter names (without types) in function declaration
gl.c:24: warning: parameter names (without types) in function declaration
gl.c:25: warning: parameter names (without types) in function declaration
gl.c:26: warning: parameter names (without types) in function declaration
gl.c:27: warning: parameter names (without types) in function declaration
gl.c:28: warning: parameter names (without types) in function declaration
gl.c:29: warning: parameter names (without types) in function declaration
gl.c:30: warning: parameter names (without types) in function declaration
gl.c:31: warning: parameter names (without types) in function declaration
gl.c:32: warning: parameter names (without types) in function declaration
gl.c:33: warning: parameter names (without types) in function declaration
gl.c:34: warning: parameter names (without types) in function declaration
gl.c:35: warning: parameter names (without types) in function declaration
gl.c: In function ‘GetOpenglVersion’:
gl.c:49: error: ‘error_checking’ undeclared (first use in this function)
gl.c:49: error: ‘Qtrue’ undeclared (first use in this function)
gl.c:49: error: ‘inside_begin_end’ undeclared (first use in this function)
gl.c:49: error: ‘Qfalse’ undeclared (first use in this function)
gl.c:51: warning: implicit declaration of function ‘sscanf’
gl.c:51: warning: incompatible implicit declaration of built-in 
function ‘sscanf’
gl.c: In function ‘GetOpenglExtensions’:
gl.c:79: error: ‘error_checking’ undeclared (first use in this function)
gl.c:79: error: ‘Qtrue’ undeclared (first use in this function)
gl.c:79: error: ‘inside_begin_end’ undeclared (first use in this function)
gl.c:79: error: ‘Qfalse’ undeclared (first use in this function)
gl.c:81: warning: implicit declaration of function ‘strlen’
gl.c:81: warning: incompatible implicit declaration of built-in 
function ‘strlen’
gl.c:82: warning: implicit declaration of function ‘ALLOC_N’
gl.c:82: error: expected expression before ‘GLchar’
gl.c:82: warning: assignment makes pointer from integer without a cast
gl.c:83: warning: implicit declaration of function ‘strcpy’
gl.c:83: warning: incompatible implicit declaration of built-in 
function ‘strcpy’
gl.c: In function ‘CheckExtension’:
gl.c:106: warning: incompatible implicit declaration of built-in 
function ‘strlen’
gl.c:107: error: expected expression before ‘GLchar’
gl.c:107: warning: assignment makes pointer from integer without a cast
gl.c:108: warning: incompatible implicit declaration of built-in 
function ‘strcpy’
gl.c:112: warning: implicit declaration of function ‘strstr’
gl.c:112: warning: incompatible implicit declaration of built-in 
function ‘strstr’
gl.c: In function ‘CheckVersionExtension’:
gl.c:128: warning: incompatible implicit declaration of built-in 
function ‘sscanf’
gl.c: At top level:
gl.c:140: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ 
before ‘IsAvailable’
gl.c:142: error: expected identifier or ‘(’ before ‘{’ token
gl.c: In function ‘CheckBufferBinding’:
gl.c:175: error: ‘rb_eRuntimeError’ undeclared (first use in this function)
gl.c:179: error: ‘error_checking’ undeclared (first use in this function)
gl.c:179: error: ‘Qtrue’ undeclared (first use in this function)
gl.c:179: error: ‘inside_begin_end’ undeclared (first use in this function)
gl.c:179: error: ‘Qfalse’ undeclared (first use in this function)
gl.c: In function ‘Init_gl’:
gl.c:185: error: ‘VALUE’ undeclared (first use in this function)
gl.c:185: error: expected ‘;’ before ‘VERSION’
gl.c:187: error: ‘module’ undeclared (first use in this function)
gl.c:187: warning: implicit declaration of function ‘rb_define_module’
gl.c:189: warning: implicit declaration of function ‘rb_define_const’
gl.c:189: error: ‘VERSION’ undeclared (first use in this function)
gl.c:208: warning: implicit declaration of 
function ‘rb_define_module_function’
gl.c:208: error: ‘IsAvailable’ undeclared (first use in this function)
rake aborted!
Command failed with status (1): 
[cc  -fPIC -fno-strict-aliasing -g  -fPIC  ...]
/var/lib/gems/1.8/gems/ruby-opengl-0.60.0/ext/gl/Rakefile:29:in `block in <top 
(required)>'
(See full trace by running task with --trace)
rake aborted!
Command failed with status (1): [rake...]

(See full trace by running task with --trace)