Gentoo's Bugzilla –
Attachment 614066 Details for
Bug 709840media-sound/audacity-2.3.3 CFLAGS=-fno-common - ld: ../lib-src/libnyquist/libnyquist.a(midifns.o):(.bss+0x2c): multiple definition of `IOnochar'; ../lib-src/libnyquist/libnyquist.a(userio.o):(.bss+0xec): first defined here