Add compilation instructions to README.md

Signed-off-by: Andreas Reichel <[email protected]>
---
 README.md | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/README.md b/README.md
index 9286d2b..aaa3d63 100644
--- a/README.md
+++ b/README.md
@@ -225,6 +225,30 @@ pacman -S gnu-efi-libs pciutils
 apt-get install gnu-efi libparted-dev libpci-dev
 ```
 
+## Compilation ##
+
+To compile `efibootguard`, checkout the sources and run
+
+```
+autoreconf -i
+./configure
+make
+```
+
+To cross-compile, the environment variables must be set accordingly, i.e. 
`CCXX=<compiler-to-use>`. The cross-compiler prefix `CROSS_COMPILE=` does *NOT* 
work. The following example shows how to specify needed paths for an 
out-of-tree build, where cross-compilation environment variables have already 
been set before:
+
+```
+mkdir build
+cd build
+autoreconf --install ..
+../configure --host=i586
+--with-gnuefi-sys-dir=/home/ch/Work/sdk/iot2000/sysroots/i586-nlp-32-poky-linux
+--with-gnuefi-include-dir=/home/ch/Work/sdk/iot2000/sysroots/i586-nlp-32-poky-linux/usr/include/efi
+--with-gnuefi-lds-dir=/home/ch/Work/sdk/iot2000/sysroots/i586-nlp-32-poky-linux/usr/lib
+--with-gnuefi-lib-dir=/home/ch/Work/sdk/iot2000/sysroots/i586-nlp-32-poky-linux/usr/lib
+make
+```
+
 ## Installation ##
 
 ### Environment setup ###
-- 
2.11.0

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