diff --git a/Makefile.am b/Makefile.am
index c5ffda6..07902f9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -12,8 +12,8 @@ cmSRC += src/libcm/cmSerialize.c src/libcm/cmSymTbl.c src/libcm/cmFileSys.c src/
 cmHDR += src/libcm/cmLib.h src/libcm/cmText.h src/libcm/cmTextTemplate.h
 cmSRC += src/libcm/cmLib.c src/libcm/cmText.c src/libcm/cmTextTemplate.c
 
-cmHDR += src/libcm/cmMath.h src/libcm/cmOp.h src/libcm/cmGnuPlot.h src/libcm/cmKeyboard.h
-cmSRC += src/libcm/cmMath.c src/libcm/cmOp.c src/libcm/cmGnuPlot.c src/libcm/cmKeyboard.c
+cmHDR += src/libcm/cmMath.h src/libcm/cmGnuPlot.h src/libcm/cmKeyboard.h
+cmSRC += src/libcm/cmMath.c src/libcm/cmGnuPlot.c src/libcm/cmKeyboard.c
 
 cmHDR += src/libcm/cmLinkedHeap.h src/libcm/cmMallocDebug.h src/libcm/cmLex.h src/libcm/cmJson.h src/libcm/cmPrefs.h src/libcm/cmStack.h
 cmSRC += src/libcm/cmLinkedHeap.c src/libcm/cmMallocDebug.c src/libcm/cmLex.c src/libcm/cmJson.c src/libcm/cmPrefs.c src/libcm/cmStack.c