Should be more portable this way.
AC_MSG_RESULT([$libdrm_cc_flag])
])
+dnl We use clock_gettime to check for timeouts in drmWaitVBlank
+
+AC_CHECK_FUNCS([clock_gettime], [CLOCK_LIB=],
+ [AC_CHECK_LIB([rt], [clock_gettime], [CLOCK_LIB=-lrt],
+ [AC_MSG_ERROR([Couldn't find clock_gettime])])])
+AC_SUBST([CLOCK_LIB])
+
dnl Use lots of warning flags with with gcc and compatible compilers
dnl Note: if you change the following variable, the cache is automatically
libdrm_la_LTLIBRARIES = libdrm.la
libdrm_ladir = $(libdir)
libdrm_la_LDFLAGS = -version-number 2:4:0 -no-undefined
-libdrm_la_LIBADD = -lrt
+libdrm_la_LIBADD = @CLOCK_LIB@
AM_CFLAGS = -I$(top_srcdir)/shared-core
libdrm_la_SOURCES = xf86drm.c xf86drmHash.c xf86drmRandom.c xf86drmSL.c \