In the Makefile there is
mkdir -m 0755 -p $(BINDIR)
but no pre-defined BINDIR. It causes error while running 'make install', see below:
# make install
mkdir -m 0755 -p /usr/local/share/php
cp -a src/op5 /usr/local/share/php/op5
mkdir -m 770 -p /etc/op5
cp -R etc/* /etc/op5
chown -R apache:apache /etc/op5
mkdir -m 0755 -p
mkdir: missing operand
Try `mkdir --help' for more information.
make: *** [install-bin] Error 1