find-package, shebang.req: introduced RPM_FINDPACKAGE_MANDATORY=1

scripts/find-package.in

@@ -63,6 +63,10 @@ Debug "RPM_FINDPACKAGE_ROOT_PATH=$RPM_FINDPACKAGE_ROOT_PATH"
 # to use the latter plan.
 RPM_FINDPACKAGE_HOST_PKG_NAMES=
 
+# When an interpreter is invoked by name, as in "#!/usr/bin/env python32",
+# and is missing, this can force the dependency on /usr/bin/python32.
+RPM_FINDPACKAGE_MANDATORY=
+
 # Below we use 'local Verbose=Info' to increase per-case verbosity.
 Verbose=Verbose
 
@@ -411,7 +415,10 @@ FindByName()
 		[!A-Za-z_]*) ;;
 		*[A-Z_]*) maybe_function=1 ;;
 	esac
-	if [ -n "$maybe_function" ]; then
+	if [ -n "$RPM_FINDPACKAGE_MANDATORY" ]; then
+		Info "$f: $r not found, forcing /usr/bin/$r"
+		printf '%s\n' "/usr/bin/$r"
+	elif [ -n "$maybe_function" ]; then
 		$Verbose "$f: $r not found (skip, maybe function)"
 	else
 		Info "$f: $r not found (skip)"

scripts/shebang.req.in

@@ -41,6 +41,7 @@ ShebangReq()
 		Warning "$f: trailing <CR> in arguments: $line"
 	}
 
+	local RPM_FINDPACKAGE_MANDATORY=1
 	case "$#,$1" in
 		1,*)
 			CheckInterp "$1"