Failed to load setuid_drv: "Driver compiled with incorrect version of erl_driver.h" when running Yaws

Question

I installed the latest release of Erlang and the lastet Yaws from the master branch. But when I try to run yaws I get an error of `Driver compiled with incorrect version of erl_driver.h". How can I fix this? Doesn't Yaws run on the latest Erlang release? I run this on Mac OS X 10.6.

jonas$ yaws
Erlang R15B01 (erts-5.9.1) [source] [smp:2:2] [async-threads:0] [hipe] [kernel-poll:true]

Eshell V5.9.1  (abort with ^G)
1> 
=ERROR REPORT==== 18-Jun-2012::00:43:08 ===
Failed to load setuid_drv (from "/usr/local/lib/yaws/priv/lib") : "Driver compiled with incorrect version of erl_driver.h"
=ERROR REPORT==== 18-Jun-2012::00:43:08 ===
FATAL {'EXIT',normal}

=INFO REPORT==== 18-Jun-2012::00:43:08 ===
    application: yaws
    exited: {shutdown,{yaws_app,start,[normal,[]]}}
    type: permanent
{"Kernel pid terminated",application_controller,"{application_start_failure,yaws,{shutdown,{yaws_app,start,[normal,[]]}}}"}

Crash dump was written to: erl_crash.dump
Kernel pid terminated (application_controller) ({application_start_failure,yaws,{shutdown,{yaws_app,start,[normal,[]]}}})

Answer 1

I'm successfully running the latest version of Yaws from github master on OS X 10.7.4 under Erlang R15B01 — it definitely works:

$ uname -a
Darwin bcc 11.4.0 Darwin Kernel Version 11.4.0: Mon Apr  9 19:32:15 PDT 2012; root:xnu-1699.26.8~1/RELEASE_X86_64 x86_64
$ yaws -i
Erlang R15B01 (erts-5.9.1) [source] [smp:8:8] [async-threads:0] [hipe] [kernel-poll:true]

Eshell V5.9.1  (abort with ^G)
1> 
=INFO REPORT==== 18-Jun-2012::10:01:33 ===
Yaws: Using config file /usr/local/etc/yaws/yaws.conf

Is there any chance you compiled your Yaws sources in the past with a previous version of Erlang (R14Bxx or older), and then tried to build again under R15B01 without first doing a "make clean"? The Erlang driver interface changed between versions 14 and 15, which might explain this error.