error installing on MinGW

Hi all-

I got this friendly msg.:
All of PostgreSQL successfully made. Ready to install.

I do these commands:
$ ./configure --host=x86_64-w64-mingw32 --prefix=/c/pgsql/
mingw32-make
mingw32-make install

Please let me know if there is an easy fix!
thnx. roboloki

I get the following output.
mingw32-make[3]: Leaving directory
'C:/msys64/home/apophis/postgresql-10.7/src/backend/utils/mb/conversion_procs/euc2004_sjis2004'
/usr/bin/install -c -m 644 conversion_create.sql '/c/pgsql/share'
/usr/bin/install: cannot stat 'conversion_create.sql': No such file or
directory
mingw32-make[2]: *** [Makefile:185: install] Error 1
mingw32-make[2]: Leaving directory
'C:/msys64/home/apophis/postgresql-10.7/src/backend/utils/mb/conversion_procs'
mingw32-make[1]: *** [Makefile:38:
install-backend/utils/mb/conversion_procs-recurse] Error 2
mingw32-make[1]: Leaving directory
'C:/msys64/home/apophis/postgresql-10.7/src'
mingw32-make: *** [GNUmakefile:11: install-src-recurse] Error 2