Installing arduino 1.8.7.v0 on OpenBSD 6.5 gives version conflicts

I have gcc 4.2.1 that came with bsd and I added gcc 8.3.0 for myself. I get the below conflicts when I try and pkg_add arduino-1.8.7.v0

quirks-3.124 signed on 2019-04-15T12:10:16Z
Collision in avr-gcc-5.4.0p2: the following files already exist
/usr/local/lib/libcc1.la (gcc-libs-8.3.0 and avr-gcc-5.4.0p2)
Collision in avr-gcc-5.4.0p2: the following files already exist
/usr/local/lib/libcc1.la (gcc-libs-8.3.0 and avr-gcc-5.4.0p2)
Can't install avr-libc-2.0.0: can't resolve avr-gcc-5.4.0p2
Can't install arduino-1.8.7v0: can't resolve avr-libc-2.0.0,avr-gcc-5.4.0p2
Couldn't install arduino-1.8.7v0 avr-gcc-5.4.0p2 avr-libc-2.0.0

I tried installing avr-libc and avr-gcc but they also gave conflicts.

What would be the best way to resolve this?

Thanks.