Problem reported by Peter Simons in:
https://lists.gnu.org/r/bug-gnulib/2018-06/msg00002.html
* modules/crypto/af_alg (Depends-on): Add c99 if USE_AF_ALG.
+2018-06-03 Paul Eggert <eggert@cs.ucla.edu>
+
+ Port crypto/af_alg to GCC 4.8.4
+ Problem reported by Peter Simons in:
+ https://lists.gnu.org/r/bug-gnulib/2018-06/msg00002.html
+ * modules/crypto/af_alg (Depends-on): Add c99 if USE_AF_ALG.
+
2018-05-27 Colin Watson <cjwatson@debian.org>
bootstrap: document source fetching in --help
m4/af_alg.m4
Depends-on:
+c99 [test $USE_AF_ALG = 1]
fseeko [test $USE_AF_ALG = 1]
ftello [test $USE_AF_ALG = 1]
sys_socket