Unable to build from the source

I'm working on windows

and i get these errors when i do an ant build on build-clean.xml (same with
build.xml) in eclipse

Description Resource Path Location Type
Project 'fred' is missing required library:
'\usr\share\java\junit.jar' fred Build
path Build Path Problem

Buildfile: C:\Documents and Settings\KMIT\git\fred-staging\build.xml
     [exec] Execute failed: java.io.IOException: Cannot run program "git":
CreateProcess error=2, The system cannot find the file specified
init:
env:
ensure-ext:
env-gjs:
ensure-gjs:
dep:
check-version-file:
build-version-file:
build:
    [javac] C:\Documents and
Settings\KMIT\git\fred-staging\build-clean.xml:165: warning:
'includeantruntime' was not set, defaulting to build.sysclasspath=last; set
to false for repeatable builds
    [javac] C:\Documents and
Settings\KMIT\git\fred-staging\build-clean.xml:177: warning:
'includeantruntime' was not set, defaulting to build.sysclasspath=last; set
to false for repeatable builds
unit-build:
     [exec] Execute failed: java.io.IOException: Cannot run program "git":
CreateProcess error=2, The system cannot find the file specified
env:
libdep-junit:

BUILD FAILED
C:\Documents and Settings\KMIT\git\fred-staging\build-clean.xml:226: The
following error occurred while executing this line:
C:\Documents and Settings\KMIT\git\fred-staging\build-clean.xml:121: JUnit
not available

Total time: 891 milliseconds

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