Attempt to debug intermittent gforth build failures.

ports/gforth/build.sh

 # Copyright (c) 2014 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # NOTE: This build doesn't work in parallel.
 OS_JOBS=1
 
 # This build relies on certain host binaries.
 HOST_BUILD_DIR=${WORK_DIR}/build_host
 HOST_INSTALL_DIR=${WORK_DIR}/install_host
 
 EXECUTABLE="gforth-ditc${NACL_EXEEXT}"
 EXECUTABLES="${EXECUTABLE}"
 MAKE_TARGETS="${EXECUTABLE}"
 
 EnableCliMain
 
 BuildHostGforth() {
-  if [[ -f "${HOST_INSTALL_DIR}/bin/gforth-ditc" ]]; then
+  if [[ -f "${HOST_INSTALL_DIR}/bin/gforth" ]]; then
     return
   fi
   Banner "Building ${PACKAGE_NAME} for host"
   MakeDir ${HOST_BUILD_DIR}
   ChangeDir ${HOST_BUILD_DIR}
   CC="gcc -m32" LogExecute ${SRC_DIR}/configure --prefix=${HOST_INSTALL_DIR}
   LogExecute make -j${OS_JOBS}
   LogExecute make install
 }
 
 ConfigureStep() {
   ChangeDir ${SRC_DIR}
   ./autogen.sh
   BuildHostGforth
   Banner "Building ${PACKAGE_NAME} for NaCl"
   export PATH="${HOST_INSTALL_DIR}/bin:${PATH}"
+  host_gforth=$(which gforth)
+  if [[ -z $host_gforth ]]; then
+    echo "Failed to find host version of gforth"
+    exit 1
+  else
+    echo "Host gforth found at: $(which gforth)"
+  fi
   export skipcode=no
   EnableGlibcCompat
   ChangeDir ${BUILD_DIR}
   EXTRA_CONFIGURE_ARGS="--without-check"
   DefaultConfigureStep
 }
 
 InstallStep() {
   return
 }
@@ skipping 25 matching lines @@
   LogExecute python ${TOOLS_DIR}/create_term.py gforth.nmf
 
   InstallNaClTerm ${PUBLISH_DIR}
 
   cp ${START_DIR}/gforth.js ${PUBLISH_DIR}/
 
   ChangeDir ${PUBLISH_DIR}
   Remove gforth.zip
   LogExecute zip -r gforth.zip .
 }