diff -up icu/source/configure.ac.dont_use_clang_even_if_installed icu/source/configure.ac
--- icu/source/configure.ac.dont_use_clang_even_if_installed	2017-02-10 13:36:23.708830671 +0100
+++ icu/source/configure.ac	2017-02-10 13:37:00.618423307 +0100
@@ -132,10 +132,10 @@ AC_SUBST(ENABLE_RELEASE)
 : ${CXXFLAGS=""}
 
 # Checks for compilers
-AC_PROG_CC([clang gcc cc c99 c89 xlc_r xlc cl.exe icc])
+AC_PROG_CC([gcc cc c99 c89 xlc_r xlc cl.exe icc])
 # Make sure that we try clang++ first, which provides C++11 support.
 # The g++ compiler is less likely to support C++11.
-AC_PROG_CXX([clang++ g++ c++ gpp xlC_r xlC aCC CC cxx cc++ cl.exe icc FCC KCC RCC])
+AC_PROG_CXX([g++ c++ gpp xlC_r xlC aCC CC cxx cc++ cl.exe icc FCC KCC RCC])
 
 # pkg-config is needed for harfbuzz support
 PKG_PROG_PKG_CONFIG([0.20])