# ./configure --enable-ansi >xx
./configure: line 8423: test: 29: unary operator expected
configure: WARNING: asm/signal.h: present but cannot be compiled
configure: WARNING: asm/signal.h: check for missing prerequisite headers?
configure: WARNING: asm/signal.h: see the Autoconf documentation
configure: WARNING: asm/signal.h: section "Present But Cannot Be Compiled"
configure: WARNING: asm/signal.h: proceeding with the compiler's result