Seems with glibc-2.22.90-23.fc24 landing today, seeing lots of c++ related build failures.  Examples include 
https://koji.fedoraproject.org/koji/taskinfo?taskID=12071892

from logs, a simple c++ test fails:

-- Check for working CXX compiler: /usr/bin/c++ -- broken
CMake Error at /usr/share/cmake/Modules/CMakeTestCXXCompiler.cmake:54 (message):
  The C++ compiler "/usr/bin/c++" is not able to compile a simple test
  program.
  It fails with the following output:
   Change Dir: /builddir/build/BUILD/kaccounts-integration-15.08.3/x86_64-redhat-linux-gnu/CMakeFiles/CMakeTmp
  
  Run Build Command:"/usr/bin/gmake" "cmTC_c9c15/fast"
  /usr/bin/gmake -f CMakeFiles/cmTC_c9c15.dir/build.make
  CMakeFiles/cmTC_c9c15.dir/build
  gmake[1]: Entering directory
  '/builddir/build/BUILD/kaccounts-integration-15.08.3/x86_64-redhat-linux-gnu/CMakeFiles/CMakeTmp'
  Building CXX object CMakeFiles/cmTC_c9c15.dir/testCXXCompiler.cxx.o
  /usr/bin/c++ -O2 -g -pipe -Wall -Werror=format-security
  -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
  --param=ssp-buffer-size=4 -grecord-gcc-switches
  -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic -o
  CMakeFiles/cmTC_c9c15.dir/testCXXCompiler.cxx.o -c
  /builddir/build/BUILD/kaccounts-integration-15.08.3/x86_64-redhat-linux-gnu/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
  Linking CXX executable cmTC_c9c15
  /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_c9c15.dir/link.txt
  --verbose=1
  /usr/bin/c++ -O2 -g -pipe -Wall -Werror=format-security
  -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
  --param=ssp-buffer-size=4 -grecord-gcc-switches
  -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic
  -Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld
  CMakeFiles/cmTC_c9c15.dir/testCXXCompiler.cxx.o -o cmTC_c9c15 -rdynamic
  /usr/bin/ld: cannot find /usr/lib64/libmvec_nonshared.a
  collect2: error: ld returned 1 exit status