--- boost-build-1.74.0.ebuild	2020-08-15 23:39:10.000000000 -0000
+++ boost-build-1.74.0.ebuild	2020-10-08 15:39:59.370922221 -0000
@@ -40,7 +40,10 @@
 }
 
 src_configure() {
-	hprefixify engine/Jambase
+	hprefixify \
+		build-system.jam \
+		engine/build.sh \
+		engine/execunix.cpp
 	tc-export CXX
 }