diff --git a/.github/workflows/analyze.yml b/.github/workflows/analyze.yml
index eef53c5..24a101d 100644
--- a/.github/workflows/analyze.yml
+++ b/.github/workflows/analyze.yml
@@ -19,7 +19,7 @@ jobs:
         
       - name: Run shellcheck
         run: |
-          shellcheck ./build.sh ./releasetools/cdimage.sh ./releasetools/floppyimage.sh ./releasetools/hdimages.sh  ./releasetools/image.defaults  ./releasetools/images.functions
+          shellcheck ./releasetools/cdimage.sh ./releasetools/floppyimage.sh ./releasetools/hdimages.sh  ./releasetools/image.defaults  ./releasetools/image.functions
 
       - name: Run CppCheck
         run: |
diff --git a/releasetools/cdimage.sh b/releasetools/cdimage.sh
index 0660e5a..85677d3 100755
--- a/releasetools/cdimage.sh
+++ b/releasetools/cdimage.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -e
 
-if [ ! -f build.sh ]
+if [ ! -f Makefile ]
 then
 	exit 1
 fi
@@ -11,3 +11,4 @@ fi
 
 DESTDIR=${BUILDDIR}/iso
 
+make
diff --git a/releasetools/floppyimage.sh b/releasetools/floppyimage.sh
index abdce9b..9507f3a 100755
--- a/releasetools/floppyimage.sh
+++ b/releasetools/floppyimage.sh
@@ -1,10 +1,14 @@
 #!/usr/bin/env bash
 set -e
 
-if [ ! -f build.sh ]
+if [ ! -f Makefile ]
 then
 	exit 1
 fi
 
 . ./releasetools/image.defaults
 . ./releasetools/image.functions
+
+DESTDIR=${BUILDDIR}/floppy
+
+export DESTDIR
diff --git a/releasetools/hdimage.sh b/releasetools/hdimage.sh
index b2bdf0d..8763de7 100755
--- a/releasetools/hdimage.sh
+++ b/releasetools/hdimage.sh
@@ -3,7 +3,7 @@ set -e
 
 : "${IMG=disk.img}"
 
-if [ ! -f build.sh ]
+if [ ! -f Makefile ]
 then
 	exit 1
 fi