Hi, I am having windows environment. I build the spidermonkey using steps mentioned in following url: http://jargon.ca/spidermonkey/ Now when I am trying to install the JavaScript.pm, it's failing with following error message. 
gcc-4 -c  -I/cygdrive/c/ravi/spidermonkey/js/src/ -I/cygdrive/c/ravi/s
+pidermonke
y/nspr-4.6.4_DBG/include/ -DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -g3
+ -fno-stri
ct-aliasing -pipe -fstack-protector -I/usr/local/include -DUSEIMPORTLI
+B -O3   -D
VERSION=\"1.16\" -DXS_VERSION=\"1.16\"  "-I/usr/lib/perl5/5.10/i686-cy
+gwin/CORE"
   JavaScript.c
JavaScript.xs:7:19: warning: extra tokens at end of #ifndef directive
JavaScript.xs: In function `XS_JavaScript__Context_jsc_ptr':
JavaScript.xs:128: warning: cast from pointer to integer of different 
+size
gcc-4 -c  -I/cygdrive/c/ravi/spidermonkey/js/src/ -I/cygdrive/c/ravi/s
+pidermonke
y/nspr-4.6.4_DBG/include/ -DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -g3
+ -fno-stri
ct-aliasing -pipe -fstack-protector -I/usr/local/include -DUSEIMPORTLI
+B -O3   -D
VERSION=\"1.16\" -DXS_VERSION=\"1.16\"  "-I/usr/lib/perl5/5.10/i686-cy
+gwin/CORE"
   PJS_Call.c
PJS_Call.c:11: warning: `PJS_call_perl_method' redeclared without dlli
+mport attr
ibute: previous dllimport ignored
PJS_Call.c:40: warning: `perl_call_sv_with_jsvals_rsv' redeclared with
+out dllimp
ort attribute: previous dllimport ignored
PJS_Call.c:113: warning: `perl_call_sv_with_jsvals' redeclared without
+ dllimport
 attribute: previous dllimport ignored
PJS_Call.c:124: warning: `PJS_call_javascript_function' redeclared wit
+hout dllim
port attribute: previous dllimport ignored
PJS_Call.c:161: warning: `perl_call_jsfunc' redeclared without dllimpo
+rt attribu
te: previous dllimport ignored
gcc-4 -c  -I/cygdrive/c/ravi/spidermonkey/js/src/ -I/cygdrive/c/ravi/s
+pidermonke
y/nspr-4.6.4_DBG/include/ -DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -g3
+ -fno-stri
ct-aliasing -pipe -fstack-protector -I/usr/local/include -DUSEIMPORTLI
+B -O3   -D
VERSION=\"1.16\" -DXS_VERSION=\"1.16\"  "-I/usr/lib/perl5/5.10/i686-cy
+gwin/CORE"
   PJS_Class.c
PJS_Class.c:14: warning: `PJS_get_method_by_name' redeclared without d
+llimport a
ttribute: previous dllimport ignored
PJS_Class.c:30: warning: `PJS_get_property_by_id' redeclared without d
+llimport a
ttribute: previous dllimport ignored
PJS_Class.c:49: warning: `PJS_free_class' redeclared without dllimport
+ attribute
: previous dllimport ignored
PJS_Class.c:91: warning: `PJS_bind_class' redeclared without dllimport
+ attribute
: previous dllimport ignored
PJS_Class.c:175: warning: `PJS_store_class' redeclared without dllimpo
+rt attribu
te after being referenced with dll linkage
PJS_Class.c:194: warning: `PJS_finalize' redeclared without dllimport 
+attribute
after being referenced with dll linkage
PJS_Class.c:205: warning: `PJS_construct_perl_object' redeclared witho
+ut dllimpo
rt attribute after being referenced with dll linkage
PJS_Class.c:243: warning: `PJS_add_class_properties' redeclared withou
+t dllimpor
t attribute after being referenced with dll linkage
PJS_Class.c:310: warning: `PJS_add_class_functions' redeclared without
+ dllimport
 attribute after being referenced with dll linkage
PJS_Class.c:377: warning: `PJS_invoke_perl_object_method' redeclared w
+ithout dll
import attribute after being referenced with dll linkage
PJS_Class.c:442: warning: `PJS_GetClassName' redeclared without dllimp
+ort attrib
ute: previous dllimport ignored
PJS_Class.c:451: warning: `PJS_GetClassPackage' redeclared without dll
+import att
ribute: previous dllimport ignored
gcc-4 -c  -I/cygdrive/c/ravi/spidermonkey/js/src/ -I/cygdrive/c/ravi/s
+pidermonke
y/nspr-4.6.4_DBG/include/ -DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -g3
+ -fno-stri
ct-aliasing -pipe -fstack-protector -I/usr/local/include -DUSEIMPORTLI
+B -O3   -D
VERSION=\"1.16\" -DXS_VERSION=\"1.16\"  "-I/usr/lib/perl5/5.10/i686-cy
+gwin/CORE"
   PJS_Context.c
PJS_Context.c:25: warning: `PJS_GetFunctionByName' redeclared without 
+dllimport
attribute: previous dllimport ignored
PJS_Context.c:41: warning: `PJS_GetClassByName' redeclared without dll
+import att
ribute: previous dllimport ignored
PJS_Context.c:57: warning: `PJS_GetClassByPackage' redeclared without 
+dllimport
attribute: previous dllimport ignored
PJS_Context.c:75: warning: `PJS_CreateContext' redeclared without dlli
+mport attr
ibute: previous dllimport ignored
PJS_Context.c:139: warning: `PJS_DestroyContext' redeclared without dl
+limport at
tribute after being referenced with dll linkage
PJS_Context.c:169: warning: `PJS_DefineFunction' redeclared without dl
+limport at
tribute: previous dllimport ignored
PJS_Context.c:202: warning: `PJS_branch_handler' redeclared without dl
+limport at
........
.......

[download]
As I don't have much idea about perl so looking for a help to resolve it.

In reply to installing JavaScript.pm using Cygwin by Anonymous Monk

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