FreeBSD out of tree driver missing rules / guide

[Vanco, Juraj]

Hello,

I try to write out of tree driver Makefile but I always get issues in headers.
My general question is if there are typical rules to compile out of tree driver.
Here is my code:

.include <bsd.init.mk>

.PATH: ${QATPATH}/qat_c3xxx $(FREEBSDPATH)

KMOD= my_module
SRCS=    my_module.c
SRCS+= device_if.h bus_if.h

.if exists(${SYSDIR}/compat/linuxkpi/common/include)
CFLAGS+= -I${SYSDIR}/compat/linuxkpi/common/include
.endif

.include <bsd.kmod.mk>

With the code above I am getting issues like
/usr/src/sys/sys/kernel.h:58:24: error: use of undeclared identifier 'MAXPATHLEN'
extern char kernelname[MAXPATHLEN];

I could be adding header by header by my own decision, but perhaps there is a rule
what headers to include to the SRCS?

jv
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