tconfig.mk: improve feature test check - dmenu - Dmenu fork with xft fonts.
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       ---
 (DIR) commit 2d2175ff6f67e2bc85138d3f359d2f7580bcb754
 (DIR) parent bbf7b95dc93a47dbb5a4143b903797dc97197515
 (HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
       Date:   Sun, 27 Sep 2015 22:38:14 +0200
       
       config.mk: improve feature test check
       
       tthis fixes a crash on NetBSD because it requires -D_XOPEN_SOURCE (strdup, usleep).
       
       tthanks k0ga and stateless for reporting and fixing this issue!
       
       Diffstat:
         config.mk                           |       2 +-
       
       1 file changed, 1 insertion(+), 1 deletion(-)
       ---
 (DIR) diff --git a/config.mk b/config.mk
       t@@ -23,7 +23,7 @@ INCS = -I${X11INC} -I${FREETYPEINC}
        LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
        
        # flags
       -CPPFLAGS = -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
       +CPPFLAGS = -D_BSD_SOURCE -D_XOPEN_SOURCE=500 -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
        CFLAGS   = -ansi -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
        LDFLAGS  = -s ${LIBS}