Gentoo, PPC: expected specifier-qualifier-list before 'stack_t'

Code:
[size=xsmall]gargamel ispcp-omega-1.0.0 # make -f Makefile.gentoo install

cd ./tools && make install

make[1]: Entering directory `/usr/local/src/ispcp/ispcp-omega-1.0.0/tools'

(cd ./daemon; \

        make ispcp_daemon;)

make[2]: Entering directory `/usr/local/src/ispcp/ispcp-omega-1.0.0/tools/daemon'

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o ispcp_daemon.o ispcp_daemon.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o message.o message.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o daemon_init.o daemon_init.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o say.o say.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o signal-handlers.o signal-handlers.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o receive_data.o receive_data.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o send_data.o send_data.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o take_connection.o take_connection.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o send_line.o send_line.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o recv_line.o recv_line.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o helo_cmd.o helo_cmd.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o helo_syntax.o helo_syntax.c

helo_syntax.c: In function 'helo_syntax':

helo_syntax.c:22: warning: ISO C90 forbids mixed declarations and code

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o lr_cmd.o lr_cmd.c

gcc -ansi -Wall -Wstrict-prototypes -pedantic -c -O3 -o lr_syntax.o lr_syntax.c

In file included from /usr/include/sys/procfs.h:30,

                 from lr_syntax.c:10:

/usr/include/sys/ucontext.h:139: error: expected specifier-qualifier-list before 'stack_t'

make[2]: *** [lr_syntax.o] Error 1

make[2]: Leaving directory `/usr/local/src/ispcp/ispcp-omega-1.0.0/tools/daemon'

make[1]: *** [daemon/ispcp_daemon] Error 2

make[1]: Leaving directory `/usr/local/src/ispcp/ispcp-omega-1.0.0/tools'

make: *** [install] Error 2[/size]