commit 291b2bb92c5fc90101417b80bbdc6c994be5fff2 (xf86drm: move ifdef __linux__
guards where needed)
introduces the following error when build on illumos (OpenIndiana):

xf86drm.c: In function 'drmGetDevices':
xf86drm.c:3021: error: 'PATH_MAX' undeclared (first use in this function)
xf86drm.c:3021: error: (Each undeclared identifier is reported only once
xf86drm.c:3021: error: for each function it appears in.)

OpenIndiana has the line
#define PATH_MAX        1024    /* max # of characters in a path name */
in /usr/include/limits.h

May be xf86drm.c should #include limits.h?