diff --git a/src/configure b/src/configure
index 69a1d5e6b09..1b1919ad032 100755
--- a/src/configure
+++ b/src/configure
@@ -1407,7 +1407,7 @@ case "$host_os" in
 esac
 
 case "`basename $INSTALL`" in
- install|installbsd|scoinst)
+ install|installbsd|scoinst|install-sh)
 	INSTLOPTS="-c $INSTLOPTS"
 	INSTL_EXE_OPTS="-c $INSTL_EXE_OPTS"
 	INSTL_LIB_OPTS="-c $INSTL_LIB_OPTS"
diff --git a/src/configure.in b/src/configure.in
index 479c840b515..1410d4c09f5 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -373,8 +373,10 @@ case "$host_os" in
 	INSTL_SHLIB_OPTS="-m 555" ;;
 esac
 
+dnl These flavors of install need -c to install by copy rather than move.
+dnl install by move is fatal because it removes stuff from the source tree!
 case "`basename $INSTALL`" in
- install|installbsd|scoinst)
+ install|installbsd|scoinst|install-sh)
 	INSTLOPTS="-c $INSTLOPTS"
 	INSTL_EXE_OPTS="-c $INSTL_EXE_OPTS"
 	INSTL_LIB_OPTS="-c $INSTL_LIB_OPTS"