From 1c9c49dd1a7a2176c8652523b3f241f10378e48a Mon Sep 17 00:00:00 2001
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Date: Tue, 19 Nov 2024 23:37:37 +0300
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---
 CMakeLists.txt | 6 +++++-
 GNUmakefile    | 6 +++---
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 86af4bed..d6e17d17 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1216,7 +1216,11 @@ endif(MDBX_INSTALL_STATIC)
 
 # collect options & build info
 if(NOT DEFINED MDBX_BUILD_TIMESTAMP)
-  string(TIMESTAMP MDBX_BUILD_TIMESTAMP UTC)
+  if(NOT "$ENV{SOURCE_DATE_EPOCH}" STREQUAL "")
+    set(FPTA_BUILD_TIMESTAMP "$ENV{SOURCE_DATE_EPOCH}")
+  else()
+    string(TIMESTAMP FPTA_BUILD_TIMESTAMP UTC)
+  endif()
 endif()
 set(MDBX_BUILD_FLAGS ${CMAKE_C_FLAGS})
 if(MDBX_BUILD_CXX)
diff --git a/GNUmakefile b/GNUmakefile
index 1b208662..69b810da 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -56,9 +56,9 @@ CMAKE_OPT ?=
 
 # build options
 MDBX_BUILD_OPTIONS   ?=-DNDEBUG=1
-MDBX_BUILD_TIMESTAMP ?=$(shell date +%Y-%m-%dT%H:%M:%S%z)
-MDBX_BUILD_CXX       ?= YES
-MDBX_BUILD_METADATA  ?= ""
+MDBX_BUILD_TIMESTAMP ?=$(if $(SOURCE_DATE_EPOCH),$(SOURCE_DATE_EPOCH),$(shell date +%Y-%m-%dT%H:%M:%S%z))
+MDBX_BUILD_CXX       ?=YES
+MDBX_BUILD_METADATA  ?=
 
 # probe and compose common compiler flags with variable expansion trick (seems this work two times per session for GNU Make 3.81)
 CFLAGS       ?= $(strip $(eval CFLAGS := -std=gnu11 -O2 -g -Wall -Werror -Wextra -Wpedantic -ffunction-sections -fPIC -fvisibility=hidden -pthread -Wno-error=attributes $$(shell for opt in -fno-semantic-interposition -Wno-unused-command-line-argument -Wno-tautological-compare; do [ -z "$$$$($(CC) '-DMDBX_BUILD_FLAGS="probe"' $$$${opt} -c $(SRC_PROBE_C) -o /dev/null >/dev/null 2>&1 || echo failed)" ] && echo "$$$${opt} "; done)$(CFLAGS_EXTRA))$(CFLAGS))