dhcpcd5: FTBFS on Hurd-i386

[Martin-Éric Racine <martin-eric.racine@iki.fi>]

Greetings,

dhcpcd5 FTBFS on Hurd-i386:

Makefile:55: warning: ignoring prerequisites on suffix rule definition
cc -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=.
-fstack-protector-strong -Wformat -Werror=format-security -std=c99
-Wdate-time -D_FORTIFY_SOURCE=2 -I/include -DHAVE_CONFIG_H -DNDEBUG
-DINET -DARP -DARPING -DIPV4LL -DINET6 -DDHCP6 -DAUTH -DPRIVSEP -I..
-I../src -I./crypt -c common.c -o common.o
In file included from ../config.h:24,
                 from dhcpcd.h:37,
                 from common.c:40:
../compat/rbtree.h:50:10: fatal error: sys/endian.h: No such file or directory
   50 | #include <sys/endian.h>
      |          ^~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [Makefile:55: common.o] Error 1
make[2]: Leaving directory '/<<PKGBUILDDIR>>/src'
make[1]: *** [Makefile:24: all] Error 2
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
dh_auto_build: error: make -j1 returned exit code 2
make: *** [debian/rules:6: binary-arch] Error 255

Would anyone have a fix for this? Thanks!

Martin-Éric