This is the error message: configure.ac:1938: error: AC_SUBST: `libdir exec_prefix prefix' is not a valid shell variable name The original statement AC_SUBST([libdir exec_prefix prefix]) should probably be AC_SUBST([libdir]) AC_SUBST([exec_prefix]) AC_SUBST([prefix]) as in X11R7.2's version of xserver/configure.ac.
Already fixed during Xorg 1.5 development: http://cgit.freedesktop.org/xorg/xserver/diff/configure.ac?h=server-1.5-branch&id=d2f44719336a800a3c9e7ba4c772f74615e91530
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