diff --git a/README.cross-compilation b/README.cross-compilation
new file mode 100644
index 000000000..9e6e4ca0f
--- /dev/null
+++ b/README.cross-compilation
@@ -0,0 +1,24 @@
+Cross-compilation is the process of compiling code for one architecture (often
+called the target) on a different system, usually called the host.
+Cross-compilation of SCST is possible as follows:
+1. Download the Linux kernel source code and also the SCST source code.
+2. Install the appropriate cross-compiler, e.g. as follows:
+
+     zypper install cross-arm-gcc9
+
+3. Store the cross-compilation prefix and architecture names in the
+   CROSS_COMPILE and ARCH environment variables, e.g. as follows:
+
+     export CROSS_COMPILE=/usr/bin/arm-suse-linux-gnueabi-
+     export ARCH=arm
+
+4. Build the Linux kernel.
+
+     cd $HOME/software/linux-kernel
+     make
+
+5. Cross-compile SCST using any of the supported build methods. An example:
+
+     export KDIR=$HOME/software/linux-kernel
+     cd scst.git
+     make rpm
diff --git a/fcst/Makefile b/fcst/Makefile
index ac6e640d4..ab7a71f4d 100644
--- a/fcst/Makefile
+++ b/fcst/Makefile
@@ -46,7 +46,9 @@ ifeq ($(KVER),)
 	make -s -C $(KDIR) kernelversion))
   endif
 else
-  KDIR := /lib/modules/$(KVER)/build
+  ifeq ($(KDIR),)
+    KDIR := /lib/modules/$(KVER)/build
+  endif
 endif
 
 ifeq ($(INSTALL_MOD_PATH),)
diff --git a/iscsi-scst/Makefile b/iscsi-scst/Makefile
index 6c488c141..9302197ba 100644
--- a/iscsi-scst/Makefile
+++ b/iscsi-scst/Makefile
@@ -34,7 +34,9 @@ ifeq ($(KVER),)
     endif
   endif
 else
-  KDIR := /lib/modules/$(KVER)/build
+  ifeq ($(KDIR),)
+    KDIR := /lib/modules/$(KVER)/build
+  endif
 endif
 
 ifeq ($(INSTALL_MOD_PATH),)
diff --git a/qla2x00t-32gbit/Makefile b/qla2x00t-32gbit/Makefile
index 2cc88c31f..dd4f889cc 100644
--- a/qla2x00t-32gbit/Makefile
+++ b/qla2x00t-32gbit/Makefile
@@ -35,7 +35,9 @@ ifeq ($(KVER),)
 	make -s -C $(KDIR) kernelversion))
   endif
 else
-  KDIR := /lib/modules/$(KVER)/build
+  ifeq ($(KDIR),)
+    KDIR := /lib/modules/$(KVER)/build
+  endif
 endif
 
 ifeq ($(INSTALL_MOD_PATH),)
diff --git a/qla2x00t-32gbit/qla2x00-target/Makefile b/qla2x00t-32gbit/qla2x00-target/Makefile
index 94598660a..e541e9da3 100644
--- a/qla2x00t-32gbit/qla2x00-target/Makefile
+++ b/qla2x00t-32gbit/qla2x00-target/Makefile
@@ -44,7 +44,9 @@ ifeq ($(KVER),)
     endif
   endif
 else
-  KDIR := /lib/modules/$(KVER)/build
+  ifeq ($(KDIR),)
+    KDIR := /lib/modules/$(KVER)/build
+  endif
 endif
 
 ifeq ($(INSTALL_MOD_PATH),)
diff --git a/qla2x00t/Makefile b/qla2x00t/Makefile
index 0dce532fa..ce1ba74c6 100644
--- a/qla2x00t/Makefile
+++ b/qla2x00t/Makefile
@@ -34,7 +34,9 @@ ifeq ($(KVER),)
 	make -s -C $(KDIR) kernelversion))
   endif
 else
-  KDIR := /lib/modules/$(KVER)/build
+  ifeq ($(KDIR),)
+    KDIR := /lib/modules/$(KVER)/build
+  endif
 endif
 
 ifeq ($(INSTALL_MOD_PATH),)
diff --git a/qla2x00t/qla2x00-target/Makefile b/qla2x00t/qla2x00-target/Makefile
index d6f3f0888..89c239c25 100644
--- a/qla2x00t/qla2x00-target/Makefile
+++ b/qla2x00t/qla2x00-target/Makefile
@@ -43,7 +43,9 @@ ifeq ($(KVER),)
     endif
   endif
 else
-  KDIR := /lib/modules/$(KVER)/build
+  ifeq ($(KDIR),)
+    KDIR := /lib/modules/$(KVER)/build
+  endif
 endif
 
 ifeq ($(INSTALL_MOD_PATH),)
diff --git a/scst/src/Makefile b/scst/src/Makefile
index 240a6061d..d611cb71f 100644
--- a/scst/src/Makefile
+++ b/scst/src/Makefile
@@ -45,7 +45,9 @@ ifeq ($(KVER),)
 	make -s -C $(KDIR) kernelversion))
   endif
 else
-  KDIR := /lib/modules/$(KVER)/build
+  ifeq ($(KDIR),)
+    KDIR := /lib/modules/$(KVER)/build
+  endif
 endif
 
 ifeq ($(INSTALL_MOD_PATH),)
diff --git a/scst/src/dev_handlers/Makefile b/scst/src/dev_handlers/Makefile
index bddc1a87f..f6c2242ab 100644
--- a/scst/src/dev_handlers/Makefile
+++ b/scst/src/dev_handlers/Makefile
@@ -39,7 +39,9 @@ ifeq ($(KVER),)
 	make -s -C $(KDIR) kernelversion))
   endif
 else
-  KDIR := /lib/modules/$(KVER)/build
+  ifeq ($(KDIR),)
+    KDIR := /lib/modules/$(KVER)/build
+  endif
 endif
 
 ifeq ($(INSTALL_MOD_PATH),)
diff --git a/scst_local/Makefile b/scst_local/Makefile
index 5dba991dc..22273223a 100644
--- a/scst_local/Makefile
+++ b/scst_local/Makefile
@@ -20,7 +20,9 @@ ifeq ($(KVER),)
 	make -s -C $(KDIR) kernelversion))
   endif
 else
-  KDIR := /lib/modules/$(KVER)/build
+  ifeq ($(KDIR),)
+    KDIR := /lib/modules/$(KVER)/build
+  endif
 endif
 
 ifeq ($(INSTALL_MOD_PATH),)
diff --git a/srpt/Makefile b/srpt/Makefile
index d96d6df9b..1d2da90c1 100644
--- a/srpt/Makefile
+++ b/srpt/Makefile
@@ -22,7 +22,9 @@ ifeq ($(KVER),)
     endif
   endif
 else
-  KDIR := /lib/modules/$(KVER)/build
+  ifeq ($(KDIR),)
+    KDIR := /lib/modules/$(KVER)/build
+  endif
 endif
 
 ifeq ($(INSTALL_MOD_PATH),)