The outline of board is not shown on Linux (gerbv 2.6.0 and compiled version 2.6A) and Win32 (2.6.0) while OSX (2.6.0) is correctly render a circle board.
With the same commit. I wonder if it is depend on 32-bit or 64-bit. I have try on three 32-bit machine the circle will not show including one brand new VM with Ubuntu 16.04 LTS. While the 64-bit version will show correctly.
Can You provide git commit hash of 2.6A?
With commit 342ca0a8efe44e5eee19640875ae0482da91fdba in Linux circle from board.outline.gbr is correctly rendered.
With the same commit. I wonder if it is depend on 32-bit or 64-bit. I have try on three 32-bit machine the circle will not show including one brand new VM with Ubuntu 16.04 LTS. While the 64-bit version will show correctly.
With reduced optimization level (-O1 or -O0) in configuration the circle will be drawn in 32-bit system.
This gerbv-sf210.patch will fix it, but...
The problem is with double comparison in calc_cirseg_mq()
Should be fixed in git commit a707671f8b859d2feaa09fce88b218c9362d60fc
Oops, the git commit is 2ebf994b3667a03c9d63828f999d5f5f9842f53c
Confirmed here. Thanks!