I'm trying to build a project, which depends on Apache httpd. Unfortunately, I have and need the httpd sources to be in /usr/includes, while the project provides its own headers for httpd (of a different version!) in $(project)/common/includes. I want the gcc to pick up the headers from the project's directory instead of the /usr/includes, but I'm afraid that even if I'm successful with it, I will probably miss other important headers from /usr/includes.
Any ideas on how to do this?
EDIT: the relevant part of the Make file looks something like this:
CFLAGS = -Wall -O3 -fPIC -fomit-frame-pointer -I vm -D_GNU_SOURCE -I libs/common -D_64BITS
EXTFLAGS = -pthread
MAKESO = $(CC) -shared #-WBsymbolic
# later ...
all: createbin libneko neko std compiler libs
neko: bin/neko
# later ...
bin/neko: $(VM_OBJECTS)
${CC} ${CFLAGS} ${EXTFLAGS} -o $@ ${VM_OBJECTS} ${NEKOVM_FLAGS}
strip bin/neko
Somewhere while executing this "recipe" I'm getting:
In file included from /usr/include/httpd/httpd.h:43:0,
from mod_neko.h:20,
from mod_neko.c:17:
/usr/include/httpd/ap_config.h:25:17: fatal error: apr.h: No such file or directory
But it shouldn't have used /usr/include/httpd/httpd.h because there's <project> /libs/include/apache2/httpd.h
Here the information about gcc includes search path
GCC looks in several different places for headers. On a normal Unix system, if you do not instruct it otherwise, it will look for headers requested with #include in:
/usr/local/include
libdir/gcc/target/version/include
/usr/target/include
/usr/include
You can add to this list with the -Idir command line option. All the directories named by -I are searched, in left-to-right order, before the default directories.