The wv2-0.2.2 configure tests for isnan in libm.
This fails on DragonFly.
checking for isnan in -lm... no
configure:13950: checking for isnan in -lm
configure:13981: cc -o conftest -DNDEBUG -O2 -O2
-Wl,-R/home/reed/pkg/lib -L/usr/lib -Wl,-R/usr/lib
conftest.c -lm -lintl -liconv >&5
/var/tmp//ccxbEVIv.o(.text+0x15): In function `main':
: undefined reference to `isnan'
Which later causes
ustring.cpp: In function `bool wvWare::isNaN(double)':
ustring.cpp:71: error: `_isnan' undeclared (first use
I don't know the fix yet, but I am reporting here so I
My workaround was to set ac_cv_lib_m_isnan=yes in my
environment and it built and installed fine.