diff --git a/packages/php/Containerfile b/packages/php/Containerfile
index c3d12e5..f1d7ddf 100644
--- a/packages/php/Containerfile
+++ b/packages/php/Containerfile
@@ -51,6 +51,8 @@ RUN tar -xf php-${VERSION}.tar.gz
 WORKDIR /php-src-php-${VERSION}
 COPY *.patch .
 ENV SOURCE_DATE_EPOCH=1
+ENV PHP_UNAME="Linux stagex"
+ENV PHP_BUILD_SYSTEM="${PHP_UNAME}"
 RUN --network=none <<-EOF
 	set -eux
 	export CFLAGS="-O2"
diff --git a/packages/socat/Containerfile b/packages/socat/Containerfile
index 3bd069d..654b4fa 100644
--- a/packages/socat/Containerfile
+++ b/packages/socat/Containerfile
@@ -15,6 +15,7 @@ COPY --from=stagex/binutils . /
 COPY --from=stagex/make . /
 RUN tar -xvf $SRC_FILE
 WORKDIR /socat-${VERSION}
+ENV SOURCE_DATE_EPOCH=1
 RUN --network=none <<-EOF
 	set -eux
 	./configure \