AC_PROG_CC
AC_PROG_CXX
PKG_CHECK_MODULES([Eigen3], [eigen3])
PKG_CHECK_MODULES([epoxy], [epoxy])
AC_PROG_CC
AC_PROG_CXX
PKG_CHECK_MODULES([Eigen3], [eigen3])
PKG_CHECK_MODULES([epoxy], [epoxy])
# Needed for unit tests and the demo app. We prefer SDL2 if possible,
# but can also use classic SDL.
# Needed for unit tests and the demo app. We prefer SDL2 if possible,
# but can also use classic SDL.