The configure script errors out when checking:
 
AC_TRY_LINK([#include <gsl/gsl_complex.h>],                                                                                                                                                                 
    [gsl_complex a; GSL_SET_COMPLEX(&a, 1.0, 1.0);   gsl_complex_logabs(a);],                                                                                                                         
    HAS_GSL_LIB=yes, HAS_GSL_LIB=no)
 
This works fine on F25.
 
I checked gsl, and the package not only hasn't changed recently, it hasn't even been built in rawhide (still f25 version). gcc has also not changed.
 
The package was building fine Friday, and in fact, still builds successfully on my rawhide box (and another developers box).
 
The failing build is here: http://koji.fedoraproject.org/koji/taskinfo?taskID=16762827
 
successful f25 build: http://koji.fedoraproject.org/koji/taskinfo?taskID=16763334
 
Any ideas?
JARED L. WALLACE
Software Engineer, Sametime Extended Support
Phone: 1-512-973-5281