Failure to compile with SBCL 1.5.6

[jmbr]

After issuing make using 02a7451, SBCL 1.5.6 crashes (see below). This issue does not occur with SBCL 1.5.5 though.

Zapping info...
CORRUPTION WARNING in SBCL pid 25396(tid 0xb7f05c0):
Memory fault at 0x0 (pc=0x100001a697, fp=0x732b08, sp=0x732b00) tid 0xb7f05c0
The integrity of this image is possibly compromised.
Continuing with fingers crossed.
While evaluating the form starting at line 14, column 0
  of #P"/Users/jbellorivas/rigetti/qvm/build-app.lisp":
Unhandled SB-SYS:MEMORY-FAULT-ERROR in thread #<SB-THREAD:THREAD "main thread" RUNNING
                                                 {10005404C3}>:
CORRUPTION WARNING in SBCL pid 25396(tid 0xb7f05c0):
Memory fault at 0x0 (pc=0x100001f917, fp=0x731a30, sp=0x731a28) tid 0xb7f05c0
The integrity of this image is possibly compromised.
Continuing with fingers crossed.
  #<error printing a SB-SYS:MEMORY-FAULT-ERROR: #<SB-SYS:MEMORY-FAULT-ERROR {1009606DA3}>>

Backtrace for: #<SB-THREAD:THREAD "main thread" RUNNING {10005404C3}>
0: (SB-DEBUG::DEBUGGER-DISABLED-HOOK #<SB-SYS:MEMORY-FAULT-ERROR {1009601D63}> #<unused argument> :QUIT T)
1: (SB-DEBUG::RUN-HOOK *INVOKE-DEBUGGER-HOOK* #<SB-SYS:MEMORY-FAULT-ERROR {1009601D63}>)
2: (INVOKE-DEBUGGER #<SB-SYS:MEMORY-FAULT-ERROR {1009601D63}>)
3: (ERROR SB-SYS:MEMORY-FAULT-ERROR :ADDRESS 0)
4: (SB-SYS:MEMORY-FAULT-ERROR #<unused argument> #.(SB-SYS:INT-SAP #X00000000))
5: ("foreign function: call_into_lisp")
6: ("foreign function: funcall2")
7: ("foreign function: handle_memory_fault_emulation_trap")
8: ("foreign function: signal_emulation_wrapper")
unhandled condition in --disable-debugger mode, quitting
CORRUPTION WARNING in SBCL pid 25396(tid 0xb7f05c0):
Memory fault at 0x0 (pc=0x1000018027, fp=0x731fc0, sp=0x731fb8) tid 0xb7f05c0
The integrity of this image is possibly compromised.
Continuing with fingers crossed.

[stylewarning]

The above is not a fix, more of a bandaid.