There's something odd (pun intended :)) going on here, none of my usual suspects
apply, but the result is that CFLAGS from the environment is not used during
build, even though %configure sets it. It gets lost somewhere.
A bit off topic, but %configuring with --disable-dependency-tracking would make
the build output cleaner and easier to notice problems like this, and could
provide a slight build speedup.
Ugh, this isn't a packaging bug. I'll have to roll a new release to fix it.
Should be fixed in 0.29.