Hi Romeo,
On Thursday 09 August 2007 20:37, Romeo Ahohe wrote:
> Hi,
>
> I was able to compile and install plib and openal using Cygwin.
> However, the configure script for SimGear is unable to find the openal
> installation. The following error message is produced when i run that
> script:
>
> checking for library containing alGenBuffers... no
> checking for library containing alutInit... no
>
> You *must* have the openal library installed on your system to build
> SimGear!
>
> Please see README.OpenAL for more details.
>
> configure aborted
>
> There was another problem too: there is no README.OpenAL in the
> directory. Instead, I only see README, README.MSVC, and README.zlib
>
> Any help will be greatly appreciated.
>
Which versions of SimGear and openal are you compiling? There used to be a
time when openal didn't compile properly under cygwin, and the solution
needed for FlightGear was to install a specially prebuild package that was
kindly provided by Norman Vine. Last time I tried, those problems were gone,
and openal now compiles fine.
There is a naming difference between the regularly built openal libraries and
the special package that was provided by Norman (IIRC). The regular libraries
are called openal and alut, whereas the special purpose build versions were
called openal32 and ALut. Older versions of SimGear (and this might very well
include the latest released version) only check for the existence of the
special purpose built library. I remember adding the additional check to the
autoconf system sometime last year, so CVS versions of SimGear should be able
to detect your openal libraries just fine.
FWIW, if not, try modifying your configure script accordingly:
dnl check for OpenAL libraries
OPENAL_OK="no"
case "${host}" in
*-*-cygwin* | *-*-mingw32*)
dnl CygWin under Windoze.
INCLUDES="$INCLUDES -I/usr/local/include/"
LIBS="$LIBS -L/usr/local/lib"
AC_SEARCH_LIBS(alGenBuffers, [ sending pixbuf data as 'image/png' (png)
AC_SEARCH_LIBS(alutInit, [ openal32 ALut alut ] )
LIBS="$LIBS -lwinmm -ldsound -ldxguid -lole32"
openal_LIBS="$LIBS"
OPENAL_OK="$ac_cv_search_alGenBuffers"
;;
*-apple-darwin*)
dnl Mac OS X
LIBS="$LIBS -framework IOKit -framework OpenAL"
openal_LIBS="$LIBS"
# not sure how to test if OpenAL exists on MacOS (does it come by
default?)
OPENAL_OK="yes"
;;
*)
dnl default unix style machines
save_LIBS=$LIBS
LIBS="$LIBS $thread_LIBS"
AC_SEARCH_LIBS(alGenBuffers, openal)
AC_SEARCH_LIBS(alutInit, [ alut openal ] )
OPENAL_OK="$ac_cv_search_alGenBuffers"
openal_LIBS="$LIBS"
LIBS=$save_LIBS
;;
esac
FWIW, inspired by your question, I tried dusting off my cygwin tools and see
if I could build FlightGear using cygwin again. So far no luck yet the
default 3.3 gccc barfs on an invalid typecast in OpenScenceGraph, and the
latest gcc version (I tried 4.2.1 and 4.1.2) also died compiling OSG with an
internal compiler error. Bizarre, because 4.1.2 is the same version as I'm
using under linux.
Hope this helps,
Durk
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