required file 'src/Makefile.in' not found

[ZiHang Gao]

$ ./bootstrap
+ test no = yes
+ aclocal -I .auto -I .
+ autoconf
+ test yes = yes
+ autoheader
+ test yes = yes
+ automake --foreign --add-missing --copy
configure.ac:7: installing '.auto/install-sh'
configure.ac:7: installing '.auto/missing'
configure.ac:37: error: required file 'src/Makefile.in' not found