[texhax] declaretheoremstyle: undefined control sequence

[wenhuo hu]

Hi everyone,

When I try this:

\documentclass{article}

\usepackage{ntheorem}
\usepackage{thmtools}
\declaretheoremstyle[headfont=\scshape,bodyfont=\itshape,numberwithin=section]{mystyle}
\declaretheorem[style=mystyle]{definition}

\usepackage[english]{babel}
\usepackage{blindtext}

\begin{document}


I got this:

! Undefined control sequence.
l.9 \declaretheoremstyle
                        [

My system is Ubuntu 12.04 with texlive, full install.

Thanks a lot!!

Wenhuo
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