CodingGuidelines: clarify C #include rules

diff --git a/Makefile b/Makefile
index c5316a34ac4e176967ae824fccabaf4c12561ae9..a53f3a8326c2e62dc79bae7169d64137ac3dab20 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -151,7 +151,7 @@ all::
 #
 # Define NEEDS_LIBINTL_BEFORE_LIBICONV if you need libintl before libiconv.
 #
-# Define NO_INTPTR_T if you don't have intptr_t nor uintptr_t.
+# Define NO_INTPTR_T if you don't have intptr_t or uintptr_t.
 #
 # Define NO_UINTMAX_T if you don't have uintmax_t.
 #
@@ -338,6 +338,9 @@ all::
 # Define TEST_GIT_INDEX_VERSION to 2, 3 or 4 to run the test suite
 # with a different indexfile format version.  If it isn't set the index
 # file format used is index-v[23].
+#
+# Define GMTIME_UNRELIABLE_ERRORS if your gmtime() function does not
+# return NULL when it receives a bogus time_t.
 
 GIT-VERSION-FILE: FORCE
        @$(SHELL_PATH) ./GIT-VERSION-GEN
@@ -1489,6 +1492,11 @@ ifneq (,$(XDL_FAST_HASH))
        BASIC_CFLAGS += -DXDL_FAST_HASH
 endif
 
+ifdef GMTIME_UNRELIABLE_ERRORS
+       COMPAT_OBJS += compat/gmtime.o
+       BASIC_CFLAGS += -DGMTIME_UNRELIABLE_ERRORS
+endif
+
 ifeq ($(TCLTK_PATH),)
 NO_TCLTK = NoThanks
 endif
@@ -2094,7 +2102,7 @@ pdf:
 
 XGETTEXT_FLAGS = \
        --force-po \
-       --add-comments \
+       --add-comments=TRANSLATORS: \
        --msgid-bugs-address="Git Mailing List <git@vger.kernel.org>" \
        --from-code=UTF-8
 XGETTEXT_FLAGS_C = $(XGETTEXT_FLAGS) --language=C \