diff --git a/src_a2b/Makefile b/src_a2b/makefile
similarity index 100%
rename from src_a2b/Makefile
rename to src_a2b/makefile
diff --git a/src_b2d/Makefile b/src_b2d/makefile
similarity index 100%
rename from src_b2d/Makefile
rename to src_b2d/makefile
diff --git a/src_m2s/Makefile b/src_m2s/makefile
similarity index 100%
rename from src_m2s/Makefile
rename to src_m2s/makefile
diff --git a/src_xpack/Makefile b/src_xpack/makefile
similarity index 100%
rename from src_xpack/Makefile
rename to src_xpack/makefile