[Buildroot] [git commit] package/pppd: fix build with kernel >= 5.15

[Buildroot] [git commit] package/pppd: fix build with kernel >= 5.15

[Thomas Petazzoni]

commit: https://git.buildroot.net/buildroot/commit/?id=c94dd92c0ff28ad72a1f9cda2d3b06d654617d40
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Fix the following build failure with kernel >= 5.15:

sys-linux.c:148:10: fatal error: linux/ipx.h: No such file or directory
  148 | #include <linux/ipx.h>
      |          ^~~~~~~~~~~~~

This hook could be removed as soon as a new pppd version is released:
https://github.com/ppp-project/ppp/pull/326

Fixes:
 - http://autobuild.buildroot.org/results/5a7f89e5178735f4d3e3f3360f0feb263f6ac431

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
 package/pppd/pppd.mk | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/package/pppd/pppd.mk b/package/pppd/pppd.mk
index 71bfceb607..19b6f3ccce 100644
--- a/package/pppd/pppd.mk
+++ b/package/pppd/pppd.mk
@@ -57,6 +57,13 @@ ifeq ($(BR2_PACKAGE_PPPD_OVERWRITE_RESOLV_CONF),y)
 PPPD_POST_EXTRACT_HOOKS += PPPD_SET_RESOLV_CONF
 endif
 
+ifeq ($(BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_15),y)
+define PPPD_DROP_IPX
+	$(SED) 's/-DIPX_CHANGE//' $(PPPD_DIR)/pppd/Makefile.linux
+endef
+PPPD_POST_EXTRACT_HOOKS += PPPD_DROP_IPX
+endif
+
 define PPPD_CONFIGURE_CMDS
 	$(SED) 's/FILTER=y/#FILTER=y/' $(PPPD_DIR)/pppd/Makefile.linux
 	$(SED) 's/ifneq ($$(wildcard \/usr\/include\/pcap-bpf.h),)/ifdef FILTER/' $(PPPD_DIR)/*/Makefile.linux
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