--- old/common/autoconf/basics.m4	2014-11-26 15:46:27.017748971 +0100
+++ new/common/autoconf/basics.m4	2014-11-26 15:46:26.921744991 +0100
@@ -987,3 +987,26 @@
     IS_RECONFIGURE=no
   fi
 ])
+
+# Check for support for specific options in bash
+AC_DEFUN_ONCE([BASIC_CHECK_BASH_OPTIONS],
+[
+  # Test if bash supports pipefail.
+  AC_MSG_CHECKING([if bash supports pipefail])
+  if ${BASH} -c 'set -o pipefail'; then
+    BASH_ARGS="$BASH_ARGS -o pipefail"
+    AC_MSG_RESULT([yes])
+  else
+    AC_MSG_RESULT([no])
+  fi
+
+  AC_MSG_CHECKING([if bash supports errexit (-e)])
+  if ${BASH} -e -c 'true'; then
+    BASH_ARGS="$BASH_ARGS -e"
+    AC_MSG_RESULT([yes])
+  else
+    AC_MSG_RESULT([no])
+  fi
+
+  AC_SUBST(BASH_ARGS)
+])
--- old/common/autoconf/configure.ac	2014-11-26 15:46:27.429766053 +0100
+++ new/common/autoconf/configure.ac	2014-11-26 15:46:27.341762404 +0100
@@ -113,6 +113,7 @@
 
 # Setup tools that requires more complex handling, or that is not needed by the configure script.
 BASIC_SETUP_COMPLEX_TOOLS
+BASIC_CHECK_BASH_OPTIONS
 
 # Check if pkg-config is available.
 PKG_PROG_PKG_CONFIG
--- old/common/autoconf/spec.gmk.in	2014-11-26 15:46:27.829782637 +0100
+++ new/common/autoconf/spec.gmk.in	2014-11-26 15:46:27.741778989 +0100
@@ -78,6 +78,11 @@
 OUTPUT_SYNC_SUPPORTED:=@OUTPUT_SYNC_SUPPORTED@
 OUTPUT_SYNC:=@OUTPUT_SYNC@
 
+# Override the shell with bash
+BASH:=@BASH@
+BASH_ARGS:=@BASH_ARGS@
+SHELL:=$(BASH) $(BASH_ARGS)
+
 # The "human readable" name of this configuration
 CONF_NAME:=@CONF_NAME@
 
@@ -502,7 +507,6 @@
 # Tools adhering to a minimal and common standard of posix compliance.
 AWK:=@AWK@
 BASENAME:=@BASENAME@
-BASH:=@BASH@
 CAT:=@CAT@
 CCACHE:=@CCACHE@
 # CD is going away, but remains to cater for legacy makefiles.
--- old/make/common/JavaCompilation.gmk	2014-11-26 15:46:28.249800050 +0100
+++ new/make/common/JavaCompilation.gmk	2014-11-26 15:46:28.153796069 +0100
@@ -126,17 +126,20 @@
   $1_FIND_PATTERNS:=$(FALSE_FIND_PATTERN) $$(patsubst %,$(SPACE)-o$(SPACE)-name$(SPACE)$(DQUOTE)*%$(DQUOTE),$$($1_SUFFIXES))
   # On windows, a lot of includes/excludes risk making the command line too long, so
   # writing the grep patterns to files.
+  # Grep returns 1 if nothing is matched. Do not fail the build for this.
   ifneq (,$$($1_INCLUDES))
     $1_GREP_INCLUDE_PATTERNS:=$$(call EscapeDollar, \
         $$(foreach src,$$($1_SRCS), $$(addprefix $$(src)/,$$($1_INCLUDES))))
     # If there are a lot of include patterns, output to file to shorten command lines
     ifeq ($$(word 20,$$($1_GREP_INCLUDE_PATTERNS)),)
-      $1_GREP_INCLUDES:=| $(GREP) $$(patsubst %,$(SPACE)-e$(SPACE)$(DQUOTE)%$(DQUOTE),$$($1_GREP_INCLUDE_PATTERNS))
+      $1_GREP_INCLUDES:=| ( $(GREP) $$(patsubst %,$(SPACE)-e$(SPACE)$(DQUOTE)%$(DQUOTE),$$($1_GREP_INCLUDE_PATTERNS)) \
+          || test "$$$$?" = "1" )
     else
       $1_GREP_INCLUDE_OUTPUT:=$(RM) $$($1_BIN)/_the.$$($1_JARNAME)_include $$(NEWLINE) \
           $$(call ListPathsSafely,$1_GREP_INCLUDE_PATTERNS,\n, \
           >> $$($1_BIN)/_the.$$($1_JARNAME)_include)
-      $1_GREP_INCLUDES:=| $(GREP) -f $$($1_BIN)/_the.$$($1_JARNAME)_include
+      $1_GREP_INCLUDES:=| ( $(GREP) -f $$($1_BIN)/_the.$$($1_JARNAME)_include \
+          || test "$$$$?" = "1" )
     endif
   endif
   ifneq (,$$($1_EXCLUDES)$$($1_EXCLUDE_FILES))
@@ -145,12 +148,14 @@
         $$($1_EXCLUDES) $$($1_EXCLUDE_FILES))))
     # If there are a lot of include patterns, output to file to shorten command lines
     ifeq ($$(word 20,$$($1_GREP_EXCLUDE_PATTERNS)),)
-      $1_GREP_EXCLUDES:=| $(GREP) -v $$(patsubst %,$(SPACE)-e$(SPACE)$(DQUOTE)%$(DQUOTE),$$($1_GREP_EXCLUDE_PATTERNS))
+      $1_GREP_EXCLUDES:=| ( $(GREP) -v $$(patsubst %,$(SPACE)-e$(SPACE)$(DQUOTE)%$(DQUOTE),$$($1_GREP_EXCLUDE_PATTERNS)) \
+          || test "$$$$?" = "1" )
     else
       $1_GREP_EXCLUDE_OUTPUT=$(RM) $$($1_BIN)/_the.$$($1_JARNAME)_exclude $$(NEWLINE) \
           $$(call ListPathsSafely,$1_GREP_EXCLUDE_PATTERNS,\n, \
           >> $$($1_BIN)/_the.$$($1_JARNAME)_exclude)
-      $1_GREP_EXCLUDES:=| $(GREP) -v -f $$($1_BIN)/_the.$$($1_JARNAME)_exclude
+      $1_GREP_EXCLUDES:=| ( $(GREP) -v -f $$($1_BIN)/_the.$$($1_JARNAME)_exclude \
+          || test "$$$$?" = "1" )
     endif
   endif
 
@@ -224,7 +229,8 @@
   # The capture metainf macro finds all files below the META-INF directory that are newer than the jar-file.
   ifeq (,$$($1_SKIP_METAINF))
     $1_CAPTURE_METAINF =$$(foreach src,$$($1_SRCS), \
-        ( $(FIND) $$(src)/META-INF -type f -a -newer $$@ 2> /dev/null | $(SED) 's|$$(src)/|-C $$(src) |g' >> \
+        ( ( $(FIND) $$(src)/META-INF -type f -a -newer $$@ 2> /dev/null || true ) \
+            | $(SED) 's|$$(src)/|-C $$(src) |g' >> \
         $$($1_BIN)/_the.$$($1_JARNAME)_contents ) $$(NEWLINE) )
   endif
   # The capture deletes macro finds all deleted files and concatenates them. The resulting file
@@ -250,7 +256,8 @@
 
   ifeq (,$$($1_SKIP_METAINF))
     $1_SCAPTURE_METAINF=$$(foreach src,$$($1_SRCS), \
-        ( $(FIND) $$(src)/META-INF -type f 2> /dev/null | $(SED) 's|$$(src)/|-C $$(src) |g' >> \
+        ( ( $(FIND) $$(src)/META-INF -type f 2> /dev/null || true ) \
+            | $(SED) 's|$$(src)/|-C $$(src) |g' >> \
         $$($1_BIN)/_the.$$($1_JARNAME)_contents) $$(NEWLINE) )
   endif
   $1_SUPDATE_CONTENTS=$(JAR) $$($1_JAR_UPDATE_OPTIONS) $$@ @$$($1_BIN)/_the.$$($1_JARNAME)_contents $$(NEWLINE)