drm.h, drm_mode.h and (at least some <driver>_drm.h files use the types int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t, int64_t and uint64_t. Per c99, these are defined in stdint.h. However, the drm.h, drm_mode.h and <driver>_drm.h files do not include stdint.h. As a result, it causes build problems with newer gcc compile versions and files that include one of these without first including stdint.h or a header file that includes stdint.h (eg xf86drm.h). For example, it breaks compilation of the xf86-video-openchrome-0.2.904 driver.

As the use in drm.h is for to non-Linux systems and the use in drm_mode.h was added after 2.4.16, and many files include xf86drm.h before the other headers. Therefore, the problem is not likely to show up too often.