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Enable _ISOC11_SOURCE

See #789

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -35,6 +35,7 @@

   add_definitions(/D_CRT_SECURE_NO_WARNINGS)

 else()

   add_compile_options(-Wall -pedantic)

+  add_definitions(-D_POSIX_C_SOURCE=200809L -D_ISOC11_SOURCE)

   if(SANITIZERS)

     set(SAN_FLAGS -fsanitize=shift -fsanitize=integer-divide-by-zero

                   -fsanitize=unreachable -fsanitize=vla-bound

--- a/Makefile

+++ b/Makefile

@@ -35,8 +35,9 @@

 # Overridable CFLAGS

 CFLAGS		?= -O3 -flto -DNDEBUG

 # Non-overridable CFLAGS

-REALCFLAGS	:= ${CFLAGS} ${WARNFLAGS} -std=gnu11 -D_POSIX_C_SOURCE=200809L \

-		   -Iinclude

+# _ISOC11_SOURCE is required on certain platforms to get C11 on top of the C99-based POSIX 2008

+REALCFLAGS	:= ${CFLAGS} ${WARNFLAGS} -std=gnu11 -I include \

+		   -D_POSIX_C_SOURCE=200809L -D_ISOC11_SOURCE

 # Overridable LDFLAGS

 LDFLAGS		?=

 # Non-overridable LDFLAGS