With a constant build date and build number, the build is reproducible.
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -123,8 +123,8 @@
 #
 VER_SRC = version.cpp
 VER_OBJ = version.o
-VER_FLG = -DMUX_BUILD_DATE="\"`date`\"" \
-          -DMUX_BUILD_NUM="\"`sh ./buildnum.sh`\""
+VER_FLG = -DMUX_BUILD_DATE="\"Sun Jul 24 08:31:40 PM MDT 2022\"" \
+          -DMUX_BUILD_NUM="\"1\""
 
 # ===================== CONFIGURATION SECTION ====================
 #