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Hi Daniel -

I've made progress with the new qserv, but I'm still running into problems. Queries are failing with:
ERROR 4110 (Proxy): Qserv error: error locking result, check qserv/db config.

In my effort to debug this, I'm having difficulty rebuilding qserv. I thought the following should work:
export PYTHONPATH=$QSERV_BASE/qserv/core/bld/dist
export LD_LIBRARY_PATH=$QSERV_BASE/lib/mysql:$QSERV_BASE/lib
pwd $QSERV_BASE/qserv/core
scons

but this yields:
scons: Reading SConscript files ...
Building into bld
using custom.py
AttributeError: 'list' object has no attribute 'prepend':
  File "/u1/bchick/src/qserv-modules/core/SConstruct", line 17:
    exports=['env', 'ARGUMENTS'])
  File "/usr/lib/scons/SCons/Script/SConscript.py", line 614:
    return method(*args, **kw)
  File "/usr/lib/scons/SCons/Script/SConscript.py", line 551:
    return _SConscript(self.fs, *files, **subst_kw)
  File "/usr/lib/scons/SCons/Script/SConscript.py", line 260:
    exec _file_ in call_stack[-1].globals
  File "/u1/bchick/src/qserv-modules/core/bld/SConscript", line 25:
    custom = detect.importCustom(env, extraTgts)
  File "/u1/bchick/src/qserv-modules/core/site_scons/detect.py", line 189:
    if existPp: ppDirs.prepend(existPp)

Am I using the correct procedure? Is this a bug?

Thanks for your help.
-- Bill
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