trying to install postgres gem on fedora 12 ..

I get these errors :

gem install pg -- --with-pgsql-include-dir='/usr/include/pgsql' --
with-pgsql-lib-dir='/usr/lib/pgsql'
Building native extensions. This could take a while...
ERROR: Error installing pg:
  ERROR: Failed to build gem native extension.

/usr/bin/ruby extconf.rb --with-pgsql-include-dir=/usr/include/pgsql --
with-pgsql-lib-dir=/usr/lib/pgsql
can't find header files for ruby.

Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/
pg-0.9.0 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/pg-0.9.0/ext/
gem_make.out

from yum list postgres*, the relevant stuff I have installed is:

Installed Packages
postgresql.i686
8.4.2-1.fc12 @updates
postgresql-devel.i686
8.4.2-1.fc12 @updates
postgresql-libs.i686
8.4.2-1.fc12 @updates
postgresql-server.i686
8.4.2-1.fc12 @updates

I tried to run this with the debuger:
ruby -r debug extconf.rb --with-pgsql-include-dir=/usr/include/pgsql --
with-pgsql-lib-dir=/usr/lib/pgsql

this block of code in /usr/lib/ruby/1.8/mkmf.rb is where the error
happens

topdir = File.dirname(libdir = File.dirname(__FILE__))
extdir = File.expand_path("ext", topdir)
$extmk = File.expand_path($0)[0, extdir.size+1] == extdir+"/"
if not $extmk and File.exist?(Config::CONFIG["archdir"] + "/ruby.h")
  $hdrdir = $topdir = Config::CONFIG["archdir"]
elsif File.exist?(($top_srcdir ||= topdir) + "/ruby.h") and
    File.exist?(($topdir ||= Config::CONFIG["topdir"]) + "/config.h")
  $hdrdir = $top_srcdir
else
  abort "can't find header files for ruby."
end

it's looking for ruby.h in either:
/usr/lib/ruby/1.8/i386-linux
/usr/lib/ruby/

and config.h in
/usr/lib/ruby/1.8/i386-linux

but those files are not there ..

so I did:

yum install ruby-devel.i686

now I get: can't find libpq-fe.h.

gem install pg -- --with-pgsql-include-dir=/usr/include/pgsql --with-
pgsql-lib-dir=/usr/lib/pgsql
Building native extensions. This could take a while...
ERROR: Error installing pg:
  ERROR: Failed to build gem native extension.

/usr/bin/ruby extconf.rb --with-pgsql-include-dir=/usr/include/pgsql --
with-pgsql-lib-dir=/usr/lib/pgsql
checking for pg_config... yes
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:
  --with-opt-dir
  --without-opt-dir
  --with-opt-include
  --without-opt-include=${opt-dir}/include
  --with-opt-lib
  --without-opt-lib=${opt-dir}/lib
  --with-make-prog
  --without-make-prog
  --srcdir=.
  --curdir
  --ruby=/usr/bin/ruby
  --with-pg
  --without-pg
  --with-pg-config
  --without-pg-config
  --with-pg-dir
  --without-pg-dir
  --with-pg-include
  --without-pg-include=${pg-dir}/include
  --with-pg-lib
  --without-pg-lib=${pg-dir}/lib
  --enable-static-build
  --disable-static-build

Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/
pg-0.9.0 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/pg-0.9.0/ext/
gem_make.out

so I did:

yum install ruby-devel.i686

now I get: can't find libpq-fe.h.

try

yum install postgresql-devel

I allready have that:

yum install postgresql-devel
Loaded plugins: presto, refresh-packagekit
Setting up Install Process
Package postgresql-devel-8.4.2-1.fc12.i686 already installed and
latest version
Nothing to do

The file is here: /usr/include/libpq-fe.h

but this doesn't work:

gem install pg -- --with-pgsql-include-dir=/usr/include
Building native extensions. This could take a while...
ERROR: Error installing pg:
  ERROR: Failed to build gem native extension.

/usr/bin/ruby extconf.rb --with-pgsql-include-dir=/usr/include
checking for pg_config... yes
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:
  --with-opt-dir
  --without-opt-dir
  --with-opt-include
  --without-opt-include=${opt-dir}/include
  --with-opt-lib
  --without-opt-lib=${opt-dir}/lib
  --with-make-prog
  --without-make-prog
  --srcdir=.
  --curdir
  --ruby=/usr/bin/ruby
  --with-pg
  --without-pg
  --with-pg-config
  --without-pg-config
  --with-pg-dir
  --without-pg-dir
  --with-pg-include
  --without-pg-include=${pg-dir}/include
  --with-pg-lib
  --without-pg-lib=${pg-dir}/lib
  --enable-static-build
  --disable-static-build

Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/
pg-0.9.0 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/pg-0.9.0/ext/
gem_make.out
[root@458869-MITLL ext]#

so I have these files in one place:

/usr/include/pgsql/internal/libpq-int.h
/usr/include/pgsql/server/libpq/libpq-be.h
/usr/include/pgsql/server/libpq/libpq.h
/usr/include/pgsql/server/libpq/libpq-fs.h

and then I have this file here:
/usr/include/libpq-fe.h

I don't know if that means I have something wrong or incompatible on
my system or if I should just try copying the file into the directory
with the other ones

so I have these files in one place:

/usr/include/pgsql/internal/libpq-int.h
/usr/include/pgsql/server/libpq/libpq-be.h
/usr/include/pgsql/server/libpq/libpq.h
/usr/include/pgsql/server/libpq/libpq-fs.h

and then I have this file here:
/usr/include/libpq-fe.h

I don't know if that means I have something wrong or incompatible on
my system or if I should just try copying the file into the directory
with the other ones

Try removing and re-installing the postgresql-devel package

yum remove postgresql-devel
yum install postgresql-devel

Ok, I just did that, but I am having a problem that my gem command is
not working all of a sudden.
I had also tried to debug the extconf.rb, I had stepped inside a
function that appeared to hang so I killed the process.

gem --help
/usr/lib/ruby/site_ruby/1.8/rubygems.rb:521:in `expand_path': No such
file or directory - getcwd (Errno::ENOENT)
  from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:521:in `find_files'
  from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:520:in `map'
  from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:520:in `find_files'
  from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:1132
  from /usr/bin/gem:8:in `require'
  from /usr/bin/gem:8

> Try removing and re-installing the postgresql-devel package
>
> yum remove postgresql-devel
> yum install postgresql-devel
>

Ok, I just did that, but I am having a problem that my gem command is
not working all of a sudden.
I had also tried to debug the extconf.rb, I had stepped inside a
function that appeared to hang so I killed the process.

gem --help
/usr/lib/ruby/site_ruby/1.8/rubygems.rb:521:in `expand_path': No such
file or directory - getcwd (Errno::ENOENT)
  from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:521:in `find_files'
  from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:520:in `map'
  from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:520:in `find_files'
  from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:1132
  from /usr/bin/gem:8:in `require'
  from /usr/bin/gem:8

----
getcwd failure seems to indicate that your current path is a directory
that no longer exists (like it was deleted)

cd /

then try again

That was strange as 'ls' showed I was in a directory, but that fixed
that problem, but after the reinstall I still have the same problem:

also, the extra args don't allways seemed to matter as I get the same
error for
just "gem install pg" without the other args

gem install pg -- --with-pgsql-include-dir=/usr/include/pgsql --with-
pgsql-lib-dir=/usr/lib/pgsql
Building native extensions. This could take a while...
ERROR: Error installing pg:
  ERROR: Failed to build gem native extension.

/usr/bin/ruby extconf.rb --with-pgsql-include-dir=/usr/include/pgsql --
with-pgsql-lib-dir=/usr/lib/pgsql
checking for pg_config... yes
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:
  --with-opt-dir
  --without-opt-dir
  --with-opt-include
  --without-opt-include=${opt-dir}/include
  --with-opt-lib
  --without-opt-lib=${opt-dir}/lib
  --with-make-prog
  --without-make-prog
  --srcdir=.
  --curdir
  --ruby=/usr/bin/ruby
  --with-pg
  --without-pg
  --with-pg-config
  --without-pg-config
  --with-pg-dir
  --without-pg-dir
  --with-pg-include
  --without-pg-include=${pg-dir}/include
  --with-pg-lib
  --without-pg-lib=${pg-dir}/lib
  --enable-static-build
  --disable-static-build

Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/
pg-0.9.0 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/pg-0.9.0/ext/
gem_make.out
[root@458869-MITLL /]#

(rdb:1) list
[683, 692] in /usr/lib/ruby/1.8/mkmf.rb
   683 #
   684 # For example, if have_header('foo.h') returned true, then the
HAVE_FOO_H
In trying to debug this, I am not sure if setting a breakpoint inside
of a block and not reaching it means that code never executed or could
it be peculiar to blocks in ruby. I feel like I want to edit the ruby
core stuff and put debug 'puts()' call in it to figure out what is
happening ..

   685 # preprocessor macro would be passed to the compiler.
   686 #
   687 def have_header(header, &b)
=> 688 checking_for header do
   689 if try_cpp(cpp_include(header), &b)
   690 $defs.push(format("-DHAVE_%s", header.tr("a-z./\055", "A-
Z___")))
   691 true
   692 else
(rdb:1) break 689
Set breakpoint 2 at /usr/lib/ruby/1.8/mkmf.rb:689
(rdb:1) c
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***

My code is dying someplace in a log file operation in mkmf.rb while
trying to find and process the header file:

module Logging
  @log = nil
  @logfile = 'mkmf.log'
  @orgerr = $stderr.dup
  @orgout = $stdout.dup
  @postpone = 0

  def self::open
    @log ||= File::open(@logfile, 'w')
    @log.sync = true
    $stderr.reopen(@log)
    $stdout.reopen(@log) # <-- execution dies here
    yield
  ensure
    $stderr.reopen(@orgerr)
    $stdout.reopen(@orgout)
  end

> ----
> getcwd failure seems to indicate that your current path is a directory
> that no longer exists (like it was deleted)
>
> cd /
>
> then try again
>

That was strange as 'ls' showed I was in a directory, but that fixed
that problem, but after the reinstall I still have the same problem:

also, the extra args don't allways seemed to matter as I get the same
error for
just "gem install pg" without the other args

gem install pg -- --with-pgsql-include-dir=/usr/include/pgsql --with-
pgsql-lib-dir=/usr/lib/pgsql
Building native extensions. This could take a while...
ERROR: Error installing pg:
  ERROR: Failed to build gem native extension.

/usr/bin/ruby extconf.rb --with-pgsql-include-dir=/usr/include/pgsql --
with-pgsql-lib-dir=/usr/lib/pgsql
checking for pg_config... yes
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:
  --with-opt-dir
  --without-opt-dir
  --with-opt-include
  --without-opt-include=${opt-dir}/include
  --with-opt-lib
  --without-opt-lib=${opt-dir}/lib
  --with-make-prog
  --without-make-prog
  --srcdir=.
  --curdir
  --ruby=/usr/bin/ruby
  --with-pg
  --without-pg
  --with-pg-config
  --without-pg-config
  --with-pg-dir
  --without-pg-dir
  --with-pg-include
  --without-pg-include=${pg-dir}/include
  --with-pg-lib
  --without-pg-lib=${pg-dir}/lib
  --enable-static-build
  --disable-static-build

Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/
pg-0.9.0 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/pg-0.9.0/ext/
gem_make.out
[root@458869-MITLL /]#

I had put debug prints in the code and the reopen of stdout messed
that up. In reality it tries the gcc command below. I did not have gcc
installed, I then installed that. When I try the gcc command line from
the log I get the error below, except I don't know what directory ruby
issues that from:

gcc -E -I. -I/usr/lib/ruby/1.8/i386-linux -I. -D_FILE_OFFSET_BITS=64 -
I/usr/include -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -
fstack-protector --param=ssp-buffer-size=4 -m32 -march=i686 -
mtune=atom -fasynchronous-unwind-tables -fno-strict-aliasing -fPIC
conftest.c -o conftest.i
gcc: conftest.c: No such file or directory

I deleted the directory as you mentioned and reran it. I have some of
my debug print code in the make file utility here in that log file as
well:

/usr/bin/ruby extconf.rb
checking for pg_config... my in check_for
my postpone:mkmftmp1.log
my open:mkmf.log
step 2
step 3
#<File:mkmf.log>
#<IO:0xb78d6f64>
yes
my check for header
checking for libpq-fe.h... my in check_for
my postpone:mkmftmp1.log
my open:mkmf.log
step 2
step 3
#<File:mkmf.log>
#<IO:0xb78d6f64>
no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:
  --with-opt-dir
  --without-opt-dir
  --with-opt-include
  --without-opt-include=${opt-dir}/include
  --with-opt-lib
  --without-opt-lib=${opt-dir}/lib
  --with-make-prog
  --without-make-prog
  --srcdir=.
  --curdir
  --ruby=/usr/bin/ruby
  --with-pg
  --without-pg
  --with-pg-config
  --without-pg-config
  --with-pg-dir
  --without-pg-dir
  --with-pg-include
  --without-pg-include=${pg-dir}/include
  --with-pg-lib
  --without-pg-lib=${pg-dir}/lib
  --enable-static-build
  --disable-static-build
[root@458869-MITLL ~]#

I deleted the directory as you mentioned and reran it. I have some of
my debug print code in the make file utility here in that log file as
well:

/usr/bin/ruby extconf.rb
checking for pg_config... my in check_for
my postpone:mkmftmp1.log
my open:mkmf.log
step 2
step 3
#<File:mkmf.log>
#<IO:0xb78d6f64>
yes
my check for header
checking for libpq-fe.h... my in check_for
my postpone:mkmftmp1.log
my open:mkmf.log
step 2
step 3
#<File:mkmf.log>
#<IO:0xb78d6f64>
no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:
  --with-opt-dir
  --without-opt-dir
  --with-opt-include
  --without-opt-include=${opt-dir}/include
  --with-opt-lib
  --without-opt-lib=${opt-dir}/lib
  --with-make-prog
  --without-make-prog
  --srcdir=.
  --curdir
  --ruby=/usr/bin/ruby
  --with-pg
  --without-pg
  --with-pg-config
  --without-pg-config
  --with-pg-dir
  --without-pg-dir
  --with-pg-include
  --without-pg-include=${pg-dir}/include
  --with-pg-lib
  --without-pg-lib=${pg-dir}/lib
  --enable-static-build
  --disable-static-build
[root@458869-MITLL ~]#

so I just did:
yum install gcc-c++ autoconf make

and deleted the ext directory and tried 'gem install pg' and go the
same error.

in the mkmf.log I saw this:

ok, it seems to have worked. Thanks alot for your help ..

I tried to be carefull, but I realize that the way ruby functions
return default values that debug code in the wrong place can mess up
the return result. I often write code to return an explicit result.
After not making any sense of why it was erroring our, I restored the
non debug version of the mkmf.rb

Jedrin wrote:

I get these errors :

gem install pg -- --with-pgsql-include-dir='/usr/include/pgsql' --
with-pgsql-lib-dir='/usr/lib/pgsql'
Building native extensions. This could take a while...
ERROR: Error installing pg:
  ERROR: Failed to build gem native extension.

/usr/bin/ruby extconf.rb --with-pgsql-include-dir=/usr/include/pgsql --
with-pgsql-lib-dir=/usr/lib/pgsql
can't find header files for ruby.

Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/
pg-0.9.0 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/pg-0.9.0/ext/
gem_make.out

from yum list postgres*, the relevant stuff I have installed is:

Installed Packages
postgresql.i686
8.4.2-1.fc12 @updates
postgresql-devel.i686
8.4.2-1.fc12 @updates
postgresql-libs.i686
8.4.2-1.fc12 @updates
postgresql-server.i686
8.4.2-1.fc12 @updates

I had same problem. But It's solved after run

yum install ruby-devel

Thanks.

just in case forks are still struggling with this(at least I was this
morning on fedora core 14 beta). I solved the same problem by installing
required development tools as:

sudo yum groupinstall 'development tools'

Cheers!

...chad