Latest Speakup won't compile

[Tony Baechler]

I've tried compiling with kernels 4.11.6 from Debian and 4.11.7 from 
kernel.org. It always stops on speakup_soft with this error:

drivers/staging/speakup/speakup_soft.c: In function 'softsynthx_read':
drivers/staging/speakup/speakup_soft.c:227:7: error: implicit declaration of 
function 'signal_pending' [-Werror=implicit-function-declaration]
    if (signal_pending(current)) {
        ^
cc1: some warnings being treated as errors
make[5]: *** [drivers/staging/speakup/speakup_soft.o] Error 1
make[5]: *** Waiting for unfinished jobs....
make[4]: *** [drivers/staging/speakup] Error 2
make[3]: *** [drivers/staging] Error 2
make[2]: *** [drivers] Error 2
make[1]: *** [bindeb-pkg] Error 2
make: *** [bindeb-pkg] Error 2

Please fix. Thanks very much!