Error compiling xpi rulesets (for Firefox) in OSX

When attempting to compile Firefox xpi files, the following error occurs:

lisa-yaos-macbook-pro:https-everywhere lisayao$ make -bash: make: command not found lisa-yaos-macbook-pro:https-everywhere lisayao$ ./makexpi.sh ** Could not import lxml! Rule validation SKIPPED. ** Caution: A resulting build MAY CONTAIN INVALID RULES. ** Please install libxml2 and lxml to permit validation! Validation of included rulesets completed.

Validation of rulesets with RELAX NG grammar completed. ~/https-everywhere/src/chrome/locale /https-everywhere Validation of included locales completed. Creating ruleset library... Removing whitespaces and comments... sed: -re: No such file or directory sed: 1: "chrome/content/rules/de ...": command c expects \ followed by text Crushed bytes of rulesets into chrome/content/rules/default.rulesets passed XML validity test. Total included rules: 3033 Rules disabled by default: 320 Created pkg/https-everywhere-3.2.2pre.xpi

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Username: lisacyao