Bug#1039080: antigrav: FTBFS with libsdl1.2-compat-dev: missing build-dependencies

[Simon McVittie <smcv@debian.org>]

Source: antigrav
Version: 0.0.3-10
Severity: important
Tags: ftbfs trixie sid

I tried recompiling antigrav with libsdl1.2-compat-dev instead of
libsdl1.2-dev, in preparation for having src:sdl12-compat take over the
libsdl1.2-dev package name.

I found that antigrav failed to build from source due to several missing
build-dependencies: it requires pkg.m4 macros, <GL/gl.h> and <GL/glu.h>,
leading to errors such as:

> ./configure: line 5844: syntax error near unexpected token `SDL,'
> ./configure: line 5844: `    PKG_CHECK_MODULES(SDL, sdl >= $min_sdl_version,'

or after installing pkgconf:

> checking for sdl >= 1.1.5... yes
> checking for GL/gl.h... no
> configure: error: *** OpenGL not found ***

I'm going to work around this by adding dependencies to
libsdl1.2-compat-dev, but please add explicit build-dependencies on
any packages that antigrav explicitly checks for.

Thanks,
    smcv