Errors when compiling sendmail ./Build

[datadan]

I am seeing some errors when installing sendmail.
How can I make these go away?
Thanks

make[1]: *** [install-docs] Error 1
make[1]: Leaving directory `/opt/Src/sendmail-8.12.10/obj.Linux.2.4.19.i686/smrsh'
Making all in:
/opt/Src/sendmail-8.12.10/vacation
Configuration: pfx=, os=Linux, rel=2.4.19, rbase=2, rroot=2.4, arch=i686, sfx=, variant=optimized
Making in /opt/Src/sendmail-8.12.10/obj.Linux.2.4.19.i686/vacation
make[1]: Entering directory `/opt/Src/sendmail-8.12.10/obj.Linux.2.4.19.i686/vacation'
install -c -o bin -g bin -m 555 vacation /usr/bin
install -c -o bin -g bin -m 444 vacation.0 /usr/man/man1/vacation.1
install: cannot create regular file `/usr/man/man1/vacation.1': No such file or directory
make[1]: *** [install-docs] Error 1
make[1]: Leaving directory `/opt/Src/sendmail-8.12.10/obj.Linux.2.4.19.i686/vacation'
make: *** [all] Error 2