make[4]: Entering directory '/builder/shared-workdir/build/sdk/build_dir/target-i386_pentium4_musl/lua-libmodbus-0.7'
i486-openwrt-linux-musl-gcc -c -Os -pipe -march=pentium4 -fno-caller-saves -fno-plt -fhonour-copts -ffile-prefix-map=/builder/shared-workdir/build/sdk/build_dir/target-i386_pentium4_musl/lua-libmodbus-0.7=lua-libmodbus-0.7 -Wformat -Werror=format-security -fstack-protector -D_FORTIFY_SOURCE=1 -Wl,-z,now -Wl,-z,relro  -I/builder/shared-workdir/build/sdk/staging_dir/toolchain-i386_pentium4_gcc-12.2.0_musl/usr/include -I/builder/shared-workdir/build/sdk/staging_dir/toolchain-i386_pentium4_gcc-12.2.0_musl/include/fortify -I/builder/shared-workdir/build/sdk/staging_dir/toolchain-i386_pentium4_gcc-12.2.0_musl/include  -g -fPIC -std=c11 -Wall -pedantic -Os -I/builder/shared-workdir/build/sdk/staging_dir/target-i386_pentium4_musl/usr/include  -o lua-libmodbus.o lua-libmodbus.c
lua-libmodbus.c:49:10: fatal error: modbus/modbus.h: No such file or directory
   49 | #include <modbus/modbus.h>
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.
make[4]: *** [Makefile:34: lua-libmodbus.o] Error 1
make[4]: Leaving directory '/builder/shared-workdir/build/sdk/build_dir/target-i386_pentium4_musl/lua-libmodbus-0.7'
make[3]: *** [Makefile:43: /builder/shared-workdir/build/sdk/build_dir/target-i386_pentium4_musl/lua-libmodbus-0.7/.built] Error 2
time: package/feeds/packages/lua-libmodbus/compile#0.62#0.28#1.95