diff --git a/regen-makefile.sh b/regen-makefile.sh
index 57eebff..6b32f75 100755
--- a/regen-makefile.sh
+++ b/regen-makefile.sh
@@ -12,6 +12,16 @@
 
 test -x "$(which ttcn3_makefilegen 2>/dev/null)" || { echo "ERROR: ttcn3_makefilegen not in PATH"; exit 1; }
 
+# Enable ccache if it can be found in path.
+# This speeds up repeated builds of the TTCN3 tests by an order of magnitude
+# since most of the generated C++ source files don't change very often.
+# Roughly, for an initial build which takes N minutes, a complete rebuild
+# after 'make clean' will only take N seconds with ccache.
+# Note that ccache cannot speed up compilation of .o files to .so files.
+if [ -z "$USE_CCACHE" ] && which ccache 2>/dev/null; then
+	USE_CCACHE=1
+fi
+
 ttcn3_makefilegen -p -l -f $*
 sed -i -e 's/# TTCN3_DIR = /TTCN3_DIR = \/usr/' Makefile
 sed -i -e 's/LDFLAGS = /LDFLAGS = -L \/usr\/lib\/titan /' Makefile
@@ -32,3 +42,11 @@
         sed -i -e 's/TTCN3_DIR = $/TTCN3_DIR = \/usr/' Makefile
 fi
 sed -i -e 's/\/bin\/compiler/\/bin\/ttcn3_compiler/' Makefile
+
+if [ "x$USE_CCACHE" = "x1" ]; then
+	# enable ccache
+	sed -i -e 's/^CXX = g++ $/CXX = env CCACHE_SLOPPINESS=time_macros ccache g++/' Makefile
+	# Append the -D option to compiler flags. This option disables timestamps
+	# inside comments in the generated C++ code which interfere with ccache.
+	sed -i -e 's/^COMPILER_FLAGS = \(.*\)/&-D/' Makefile
+fi