Thanks for your kind help / suggestions.<br><br>Here is a more verbose version of the compile error output.<br><br>paul@linux-jkcx:~/src/openbios-devel&gt; env V=1 make build-verbose<br>Building...<br>make[1]: Entering directory `/home/paul/src/openbios-devel/obj-sparc32&#39;<br>
true<br>true<br>gcc -O2 -g -DFCOMPILER -DBOOTSTRAP -DSWAP_ENDIANNESS -DNATIVE_BITWIDTH_EQUALS_HOST_BITWIDTH -Wall -Wredundant-decls -Wshadow -Wpointer-arith -Wstrict-prototypes -Wmissing-declarations -Wundef -Wendif-labels -Wstrict-aliasing -Wwrite-strings -Wmissing-prototypes -Wnested-externs -W -MMD -MP -MT host/kernel/dict.o -MF &#39;host/kernel/dict.d&#39; -I../include -I../kernel -I../kernel/include -I./target/include -c -o host/kernel/dict.o ../kernel/dict.c<br>
gcc -O2 -g -DFCOMPILER -DBOOTSTRAP -DSWAP_ENDIANNESS -DNATIVE_BITWIDTH_EQUALS_HOST_BITWIDTH -Wall -Wredundant-decls -Wshadow -Wpointer-arith -Wstrict-prototypes -Wmissing-declarations -Wundef -Wendif-labels -Wstrict-aliasing -Wwrite-strings -Wmissing-prototypes -Wnested-externs -W -MMD -MP -MT host/kernel/bootstrap.o -MF &#39;host/kernel/bootstrap.d&#39; -I../include -I../kernel -I../kernel/include -I./target/include -c -o host/kernel/bootstrap.o ../kernel/bootstrap.c<br>
In file included from /usr/include/asm/sigcontext.h:5:0,<br>                 from /usr/include/bits/sigcontext.h:28,<br>                 from /usr/include/signal.h:339,<br>                 from ../kernel/bootstrap.c:13:<br>
/usr/include/linux/types.h:27:1: error: unknown type name ‘__u16’<br>/usr/include/linux/types.h:28:1: error: unknown type name ‘__u16’<br>/usr/include/linux/types.h:29:1: error: unknown type name ‘__u32’<br>/usr/include/linux/types.h:30:1: error: unknown type name ‘__u32’<br>
/usr/include/linux/types.h:31:1: error: unknown type name ‘__u64’<br>/usr/include/linux/types.h:32:1: error: unknown type name ‘__u64’<br>/usr/include/linux/types.h:34:1: error: unknown type name ‘__u16’<br>/usr/include/linux/types.h:35:1: error: unknown type name ‘__u32’<br>
In file included from /usr/include/bits/sigcontext.h:28:0,<br>                 from /usr/include/signal.h:339,<br>                 from ../kernel/bootstrap.c:13:<br>/usr/include/asm/sigcontext.h:24:2: error: unknown type name ‘__u32’<br>
/usr/include/asm/sigcontext.h:25:2: error: unknown type name ‘__u32’<br>/usr/include/asm/sigcontext.h:28:2: error: unknown type name ‘__u64’<br>/usr/include/asm/sigcontext.h:33:2: error: unknown type name ‘__u32’<br>/usr/include/asm/sigcontext.h:38:2: error: unknown type name ‘__u32’<br>
/usr/include/asm/sigcontext.h:191:2: error: unknown type name ‘__u64’<br>/usr/include/asm/sigcontext.h:192:2: error: unknown type name ‘__u64’<br>/usr/include/asm/sigcontext.h:193:2: error: unknown type name ‘__u64’<br>/usr/include/asm/sigcontext.h:198:2: error: unknown type name ‘__u32’<br>
make[1]: *** [host/kernel/bootstrap.o] Error 1<br>make[1]: Leaving directory `/home/paul/src/openbios-devel/obj-sparc32&#39;<br>make: *** [build-verbose] Error 1<br><br>