[Iasl] Error reported when compiling Xen source code

When compiling Xen source code, an error [iasl] is reported. When compiling xen source code in CentOS5.4: Execute make xen tools stubdom, the following error is reported: acpi asl compiler (iasl) is needed www.2cto.com Download and install Intel acpi ca fromhttp: // acpica.org/downloads/ make [8]: *** [iasl] Error 1 make [8]: leaving directory '/home/Downloads/xen-4.0.1/tools/firmware/hvmloader/acpi' make [7]: *** [subdir-all-acpi] Error 2 make [7]: leaving directory '/home/Downloads/xen-4.0.1/tools/firmware/hvmloader' make [6]: *** [subdirs-all] Error 2 make [6]: leaving directory '/home/Downloads/xen-4.0.1/tools/firmware/hvmloader' make [5]: *** [subdir-all-hvmloader] Error 2 make [5]: leaving directory '/home/Downloads/xen-4.0.1/tools/firmware' make [4]: *** [subdirs-all] Error 2 make [4]: leaving directory '/home/Downloads/xen-4.0.1/tools/firmware' make [3]: *** [all] Error 2 make [3]: leaving directory '/home/Downloads/xen-4.0.1/tools/firmware' make [2]: *** [subdir-install-firmware] Error 2 make [2]: leaving directory '/home/Downloads/xen-4.0.1/tool' make [1]: *** [subdirs-install] Error 2 make [1]: leaving directory '/home/Downloads/xen-4.0.1/tools' make: *** [install-tools] Error 2 solution: execute the following command: yum install iasl