commit a9a3836861bd23387b5a51d6f6ac23377e98e26f
from: Hiltjo Posthuma <hiltjo@codemadness.org>
date: Mon Feb  7 09:36:13 2022 UTC

follow-up fix: add -D_GNU_SOURCE for strcasestr for some systems

commit - eb96af27f4059c93d7e000e910b71d74829a239b
commit + a9a3836861bd23387b5a51d6f6ac23377e98e26f
blob - 05d5a3e801e838c6a8a5e02834d63dd880bd66da
blob + bea4e4bdeaac2f1f945a76dcb2b947f89f3c9ee2
--- config.mk
+++ config.mk
@@ -23,7 +23,7 @@ INCS = -I$(X11INC) -I$(FREETYPEINC)
 LIBS = -L$(X11LIB) -lX11 $(XINERAMALIBS) $(FREETYPELIBS)
 
 # flags
-CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L -DVERSION=\"$(VERSION)\" $(XINERAMAFLAGS)
+CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_GNU_SOURCE -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L -DVERSION=\"$(VERSION)\" $(XINERAMAFLAGS)
 CFLAGS   = -std=c99 -pedantic -Wall -Os $(INCS) $(CPPFLAGS)
 LDFLAGS  = $(LIBS)