undefined reference to `_wait_r'

[LiEnby]

making ruby
make[1]: Entering directory '/home/silica/ruby'
arm-vita-eabi-gcc -O2 -g -Wall -Wno-parentheses -Wno-long-long  -DRUBY_EXPORT  -L.    main.o  -Wl,-R -Wl,/home/silica/ruby-bin/lib -L/home/silica/ruby-bin/lib -lruby-static -lm   -o ruby
/usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/10.3.0/../../../../arm-vita-eabi/bin/ld: /usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/10.3.0/../../../../arm-vita-eabi/lib/libg.a(lib_a-syswait.o): in function `wait':
syswait.c:(.text.wait+0xe): undefined reference to `_wait_r'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:117: ruby] Error 1
make[1]: Leaving directory '/home/silica/ruby'
make: *** [Makefile:324: main] Error 2

[Princess-of-Sleeping]

Try make with -DREENTRANT_SYSCALLS_PROVIDED

[isage]

There's no wait, because there's no child processes (e.g. fork).
All we can do is stub it.