diff --git a/pika-build-config/amd64-v3.sh b/pika-build-config/amd64-v3.sh
index 1bad467..10285b4 100755
--- a/pika-build-config/amd64-v3.sh
+++ b/pika-build-config/amd64-v3.sh
@@ -1,10 +1,10 @@
-PIKA_BUILD_ARCH="amd64-v3"
-DEBIAN_FRONTEND="noninteractive"
-DEB_BUILD_MAINT_OPTIONS="optimize=+lto -march=x86-64-v3 -O3 -flto -fuse-linker-plugin -falign-functions=32"
-DEB_CFLAGS_MAINT_APPEND="-march=x86-64-v3 -O3 -flto -fuse-linker-plugin -falign-functions=32"
-DEB_CPPFLAGS_MAINT_APPEND="-march=x86-64-v3 -O3 -flto -fuse-linker-plugin -falign-functions=32"
-DEB_CXXFLAGS_MAINT_APPEND="-march=x86-64-v3 -O3 -flto -fuse-linker-plugin -falign-functions=32"
-DEB_LDFLAGS_MAINT_APPEND="-march=x86-64-v3 -O3 -flto -fuse-linker-plugin -falign-functions=32"
-DEB_BUILD_OPTIONS="nocheck notest terse"
-DPKG_GENSYMBOLS_CHECK_LEVEL=0
-DRIVER_ARCH="Linux-x86_64"
+#! /bin/bash
+export PIKA_BUILD_ARCH="amd64-v3"
+export DEBIAN_FRONTEND="noninteractive"
+export DEB_BUILD_MAINT_OPTIONS="optimize=+lto -march=x86-64-v3 -O3 -flto -fuse-linker-plugin -falign-functions=32"
+export DEB_CFLAGS_MAINT_APPEND="-march=x86-64-v3 -O3 -flto -fuse-linker-plugin -falign-functions=32"
+export DEB_CPPFLAGS_MAINT_APPEND="-march=x86-64-v3 -O3 -flto -fuse-linker-plugin -falign-functions=32"
+export DEB_CXXFLAGS_MAINT_APPEND="-march=x86-64-v3 -O3 -flto -fuse-linker-plugin -falign-functions=32"
+export DEB_LDFLAGS_MAINT_APPEND="-march=x86-64-v3 -O3 -flto -fuse-linker-plugin -falign-functions=32"
+export DEB_BUILD_OPTIONS="nocheck notest terse"
+export DPKG_GENSYMBOLS_CHECK_LEVEL=0
diff --git a/pika-build-config/i386.sh b/pika-build-config/i386.sh
index 8378867..8d23a03 100755
--- a/pika-build-config/i386.sh
+++ b/pika-build-config/i386.sh
@@ -1,5 +1,4 @@
-PIKA_BUILD_ARCH="i386"
-DEBIAN_FRONTEND="noninteractive"
-DEB_BUILD_OPTIONS="nocheck notest terse"
-DPKG_GENSYMBOLS_CHECK_LEVEL=0
-DRIVER_ARCH="Linux-x86_64"
+export PIKA_BUILD_ARCH="i386"
+export DEBIAN_FRONTEND="noninteractive"
+export DEB_BUILD_OPTIONS="nocheck notest terse"
+export DPKG_GENSYMBOLS_CHECK_LEVEL=0