diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 945ac53..2e04f23 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
         GITHUB_CONTEXT: ${{ toJson(github) }}
       run: echo "$GITHUB_CONTEXT"
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Install deps
       run: |
@@ -42,12 +42,13 @@ jobs:
 
   test-package:
     strategy:
+      fail-fast: false
       matrix:
-        os: ["buster", "bullseye", "testing", "unstable"]
+        os: ["buster", "bullseye", "stable", "testing", "unstable"]
         cpu: ["i386", "amd64", "armhf", "aarch64"]
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
 
@@ -67,7 +68,7 @@ jobs:
         head debian/changelog
 
     - name: Build Debian package
-      uses: dawidd6/action-debian-package@v1
+      uses: dawidd6/action-debian-package@v1.6.0
       with:
         source_directory: .
         artifacts_directory: output
@@ -75,7 +76,7 @@ jobs:
         cpu_architecture: ${{ matrix.cpu }}
 
     - name: Upload artifact
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         path: output
         name: debs-${{ matrix.os }}-${{ matrix.cpu }}
diff --git a/Makefile b/Makefile
index 6acd906..c87dfff 100644
--- a/Makefile
+++ b/Makefile
@@ -25,6 +25,7 @@ CC = gcc
 RM = rm -f
 AR = ar
 RANLIB = ranlib
+PKG_CONFIG ?= pkg-config
 
 OWNERSHIP ?= --owner root --group root
 
@@ -46,25 +47,25 @@ CFLAGS ?= -O0 -g -Wall -Wextra -Werror
 CFLAGS += -std=c99
 
 ifeq ($(TARGET),linux)
-    $(shell which pkg-config > /dev/null)
+    $(shell which $(PKG_CONFIG) > /dev/null)
     ifeq ($(.SHELLSTATUS), 1)
         $(error "can't find pkg-config")
     endif
 
-    $(shell pkg-config --exists libpci > /dev/null)
+    $(shell $(PKG_CONFIG) --exists libpci > /dev/null)
     ifeq ($(.SHELLSTATUS), 1)
         $(error "pkg-config can't find libpci")
     endif
 
-    $(shell pkg-config --exists libmd > /dev/null)
+    $(shell $(PKG_CONFIG) --exists libmd > /dev/null)
     ifeq ($(.SHELLSTATUS), 1)
         $(error "pkg-config can't find libmd")
     endif
 
-    LIBPCI_CFLAGS := $(shell pkg-config --cflags libpci)
-    LIBPCI_LDFLAGS := $(shell pkg-config --libs libpci)
-    LIBMD_CFLAGS := $(shell pkg-config --cflags libmd)
-    LIBMD_LDFLAGS := $(shell pkg-config --libs libmd)
+    LIBPCI_CFLAGS := $(shell $(PKG_CONFIG) --cflags libpci)
+    LIBPCI_LDFLAGS := $(shell $(PKG_CONFIG) --libs libpci)
+    LIBMD_CFLAGS := $(shell $(PKG_CONFIG) --cflags libmd)
+    LIBMD_LDFLAGS := $(shell $(PKG_CONFIG) --libs libmd)
     BIN = mesaflash
     LDFLAGS = -lm $(LIBPCI_LDFLAGS) $(LIBMD_LDFLAGS)
     CFLAGS += -D_GNU_SOURCE $(LIBPCI_CFLAGS) $(LIBMD_CFLAGS) -D_FILE_OFFSET_BITS=64
diff --git a/debian/rules b/debian/rules
index 4acc9f1..2f70542 100755
--- a/debian/rules
+++ b/debian/rules
@@ -1,6 +1,13 @@
 #!/usr/bin/make -f
+include /usr/share/dpkg/architecture.mk
+DPKG_EXPORT_BUILDTOOLS=1
+include /usr/share/dpkg/buildtools.mk
 include /usr/share/dpkg/pkg-info.mk
 
+# Makefile uses uname, which is wrong for cross builds.
+MESAFLASH_IO:=$(if $(wildcard /usr/include/$(DEB_HOST_MULTIARCH)/asm/io.h),1,0)
+export MESAFLASH_IO
+
 %:
 	dh $@