[Bug target/66840] [5/6 Regression] plugins fail to build on powerpc64le-linux-gnu

[sch...@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66840

--- Comment #1 from Andreas Schwab <sch...@linux-m68k.org> ---
Add it to TM_H.