gtk2 dumps core on Solaris 8/Sparc

I'm building Moz 1.3 final on Sol 8/Sparc with the gtk2 toolkit. The 
build goes ok, but it never starts up - it core dumps with a Bus Error 
almost immediately. My .mozconfig and the stack trace follow. Am I doing 
something wrong?

-Jerry


.mozconfig:

ac_add_options --disable-tests
ac_add_options --disable-debug
ac_add_options --enable-optimize
ac_add_options --without-system-nspr
ac_add_options --without-system-zlib
ac_add_options --without-system-jpeg
ac_add_options --without-system-png
ac_add_options --without-system-mng
ac_add_options --enable-crypto
ac_add_options --enable-js-ultrasparc
ac_add_options --enable-extensions
ac_add_options --enable-calendar
ac_add_options --enable-xft
ac_add_options --disable-jsd
ac_add_options --enable-ldap-experimental
ac_add_options --enable-default-toolkit=gtk2
ac_add_options --disable-toolkit-gtk

stack trace:

(dbx) where
current thread: t@1
=>[1] GetLine__13nsExpatDriverPCcUiUiR8nsString(0x2d9940, 0x35e2a0, 
0x1000, 0xffffffff, 0xffbea788, 0x3602b0), at 0xfd4a980c
   [2] HandleError__13nsExpatDriverPCcUii(0x2d9940, 0x35e2a0, 0x2000, 
0x0, 0x35e1a0, 0x0), at 0xfd4a95c0
   [3] ParseBuffer__13nsExpatDriverPCcUii(0x2d9940, 0x35e2a0, 0x2000, 
0x0, 0xfdb60854, 0x0), at 0xfd4a978c
   [4] ConsumeToken__13nsExpatDriverR9nsScannerRi(0x2d9940, 0x28a0d0, 
0xffbeaa40, 0x2d9944, 0xfd4a9918, 0xfe9942f4), at 0xfd4a997c
   [5] Tokenize__8nsParseri(0x266f38, 0x0, 0xfd4aa0e4, 0x2d9940, 0x1000, 
0xffbeab2c), at 0xfd4c2900
   [6] ResumeParse__8nsParseriii(0x266f38, 0x804e03f7, 0x0, 0x804e03f0, 
0x1, 0x1), at 0xfd4c05fc
   [7] 
OnDataAvailable__8nsParserP10nsIRequestP11nsISupportsP14nsIInputStreamUiUi(0x0, 
0x2997c0, 0x0, 0x35e1c0, 0x0, 0x1000), at 0xfd4c2468
   [8] 
OnDataAvailable__20RDFXMLDataSourceImplP10nsIRequestP11nsISupportsP14nsIInputStreamUiUi(0x2c3e18, 
0x2997c0, 0x0, 0x35e1c0, 0x0, 0x1000), at 0xfd598fe0
   [9] 
BlockingParse__20RDFXMLDataSourceImplP6nsIURIP17nsIStreamListener(0x0, 
0xffffefb8, 0x2c3e28, 0x2c3e44, 0xfd599444, 0xfd7d9a18), at 0xfd597c34
   [10] Refresh__20RDFXMLDataSourceImpli(0x2c3e18, 0x1, 0x2c3e1c, 
0xfd598868, 0x30c334, 0xfdb22614), at 0xfd598974
   [11] 
LoadDataSource__16nsChromeRegistryRC10nsACStringPP16nsIRDFDataSourceiPCc(0x0, 
0xffbebe18, 0xffbebf10, 0x1, 0x0, 0x1), at 0xfd5df1b8
   [12] AddToCompositeDataSource__16nsChromeRegistryi(0x30c300, 0x1, 
0x6, 0x1b, 0x0, 0x0), at 0xfd5e88e4
   [13] LoadProfileDataSource__16nsChromeRegistry(0x0, 0x0, 0xe8, 
0xffbec0e8, 0x0, 0x0), at 0xfd5e9574
   [14] ConvertChromeURL__16nsChromeRegistryP6nsIURIR10nsACString(0x0, 
0x347458, 0xffbec2f0, 0xfd5dbfb0, 0x0, 0x0), at 0xfd5dc064
   [15] NewChannel__23nsChromeProtocolHandlerP6nsIURIPP10nsIChannel(0x0, 
0x347458, 0xffbec4e4, 0xfd5ed658, 0xffbec528, 0xfd5ed3b8), at 0xfd5ed8d0
   [16] NewChannelFromURI__11nsIOServiceP6nsIURIPP10nsIChannel(0x0, 
0x347458, 0xffbec4e4, 0xfd7d9c98, 0xffbec528, 0xfd7d9a18), at 0xfd7d9ebc
   [17] LoadProperties__14nsStringBundle(0x2b1ed8, 0x99eb0, 0xffbec6a8, 
0xfe4755a0, 0x0, 0x0), at 0xfe473634
   [18] GetStringFromID__14nsStringBundleiPPUs(0x2b1ed8, 0x12, 0x367030, 
0xfe473d18, 0x1, 0x0), at 0xfe473d28
   [19] GetLocalizedStringByID__16nsParserMsgUtilsPCcUiR8nsString(0x0, 
0x12, 0xffbec8d0, 0x0, 0xa, 0xcefd8), at 0xfd4cc32c
   [20] HandleError__13nsExpatDriverPCcUii(0x35b7a8, 0x3583a8, 0x452, 
0x0, 0x365a40, 0x1), at 0xfd4a94b0
   [21] ParseBuffer__13nsExpatDriverPCcUii(0x35b7a8, 0x3583a8, 0x452, 
0x0, 0xfdb60854, 0x1), at 0xfd4a978c
   [22] ConsumeToken__13nsExpatDriverR9nsScannerRi(0x35b7a8, 0x286880, 
0xffbecaf8, 0x35b7ac, 0xfd4a9918, 0x1), at 0xfd4a997c
   [23] Tokenize__8nsParseri(0x346e90, 0x0, 0xfd4aa0e4, 0x35b7a8, 0x229, 
0xffbecbe4), at 0xfd4c2900
   [24] ResumeParse__8nsParseriii(0x346e90, 0x804e03f7, 0x0, 0x804e03f0, 
0x1, 0x1), at 0xfd4c05fc
   [25] 
OnDataAvailable__8nsParserP10nsIRequestP11nsISupportsP14nsIInputStreamUiUi(0x0, 
0xdbf08, 0x0, 0x365ae0, 0x0, 0x229), at 0xfd4c2468
   [26] 
OnDataAvailable__20RDFXMLDataSourceImplP10nsIRequestP11nsISupportsP14nsIInputStreamUiUi(0x270038, 
0xdbf08, 0x0, 0x365ae0, 0x0, 0x229), at 0xfd598fe0
   [27] 
BlockingParse__20RDFXMLDataSourceImplP6nsIURIP17nsIStreamListener(0x0, 
0xffffefb8, 0x270048, 0x270064, 0xfd599444, 0xfd7d9a18), at 0xfd597c34
   [28] Refresh__20RDFXMLDataSourceImpli(0x270038, 0x1, 0x27003c, 
0xfd598868, 0x0, 0x0), at 0xfd598974
   [29] InstallProvider__16nsChromeRegistryRC10nsACStringT1iii(0x0, 
0xffbee368, 0xffbee358, 0x0, 0x1, 0x0), at 0xfd5e3d30
   [30] InstallPackage__16nsChromeRegistryPCci(0x30c300, 0xffbee458, 
0x0, 0xfd5e74ac, 0x21cc8, 0x0), at 0xfd5e7554
   [31] ProcessNewChromeBuffer__16nsChromeRegistryPci(0x30c300, 0xd11a9, 
0xd28a9, 0x30c300, 0xd1168, 0x5a548), at 0xfd5eab80
   [32] CheckForNewChrome__16nsChromeRegistry(0x0, 0xfd5e9e30, 
0xfd5f0168, 0x1, 0xfdae42f4, 0xfdb69588), at 0xfd5ea200
   [33] Init__16nsChromeRegistry(0x0, 0xfd5dad6c, 0x63a00, 0x3a344, 
0x31005669, 0x31000000), at 0xfd5db598
   [34] nsChromeRegistryConstructor(0x0, 0x4263c, 0xffbee870, 
0xfd5da090, 0xffbee7fc, 0xfdb26840), at 0xfd5da0e4
   [35] 
CreateInstance__16nsGenericFactoryP11nsISupportsRC4nsIDPPv(0xdfbe8, 0x0, 
0x4263c, 0xffbee870, 0xfdb68d64, 0x0), at 0xfdb68d94
   [36] 
CreateInstanceByContractID__22nsComponentManagerImplPCcP11nsISupportsRC4nsIDPPv(0x6a9c8, 
0xfcc9c080, 0x0, 0x4263c, 0xffbee870, 0xfdb22614), at 0xfdb22698
   [37] 
GetServiceByContractID__22nsComponentManagerImplPCcRC4nsIDPPv(0x6a9c8, 
0xfcc9c080, 0x4263c, 0xffbee974, 0xfdb23248, 0x5), at 0xfdb23368
   [38] __cl__C24nsGetServiceByContractIDRC4nsIDPPv(0xffbeea60, 0x4263c, 
0xffbee974, 0x3aba0, 0x34d4b0, 0x1), at 0x3ac1c
   [39] 
assign_from_helper__13nsCOMPtr_baseRC15nsCOMPtr_helperRC4nsID(0xffbeea58, 
0xffbeea60, 0x4263c, 0xffbeea50, 0xfdafbd58, 0x0), at 0x3a444
   [40] DefineLocaleDefaultsDir__9nsProfile(0x80000000, 0x344018, 
0xfcc9c4e0, 0xffbeeb08, 0xfdae43fc, 0x344098), at 0xfcc903f4
   [41] SetCurrentProfile__9nsProfilePCUs(0x0, 0xafb50, 0x344018, 0x0, 
0x0, 0x0), at 0xfcc8d7b0
   [42] LoadDefaultProfileDir__9nsProfileR9nsCStringi(0x0, 0xffbeefe0, 
0x1, 0xffbeee5c, 0xffbeefe0, 0x0), at 0xfcc8a494
   [43] StartupWithArgs__9nsProfileP17nsICmdLineServicei(0x344018, 
0x6a790, 0x1, 0xfcc893b0, 0x0, 0x0), at 0xfcc89458
   [44] DoProfileStartup__17nsAppShellServiceP17nsICmdLineServicei(0x0, 
0x6a790, 0x1, 0xfc18c170, 0x0, 0x0), at 0xfc18c268
   [45] InitializeProfileService(0x6a790, 0xfc18e4f0, 0x332268, 
0xfc18bc3c, 0xffbef0b0, 0x42b48), at 0x1f05c
   [46] main1(0x0, 0x5be88, 0x30fa78, 0x21860, 0x30b78, 0x0), at 0x1fe48
   [47] main(0x0, 0xffbef394, 0xffbef39c, 0x5ca78, 0x0, 0x0), at 0x20930