Problem using discount library

[Abdeljalil]

i’m working on project that uses discount library.
http://www.pell.portland.or.us/~orc/Code/discount/
i installed the library on my machine and included:

#include <mkdio.h>

#include <mkdio.h>

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and i have this piece of code:

MMIOT* document = 0;
    char* result;
    QString sourceMarkdown(markdown);
    if (!sourceMarkdown.endsWith('\n'))
        sourceMarkdown.append('\n');
    QByteArray data = sourceMarkdown.toUtf8();
    document = mkd_string(data,data.length(),MKD_NOPANTS);
    mkd_compile(document,MKD_NOPANTS);
    mkd_document(document,&result);
    QString renderedHtml = QString::fromUtf8(result);
    return renderedHtml;

MMIOT* document = 0;
    char* result;
    QString sourceMarkdown(markdown);
    if (!sourceMarkdown.endsWith('\n'))
        sourceMarkdown.append('\n');
    QByteArray data = sourceMarkdown.toUtf8();
    document = mkd_string(data,data.length(),MKD_NOPANTS);
    mkd_compile(document,MKD_NOPANTS);
    mkd_document(document,&result);
    QString renderedHtml = QString::fromUtf8(result);
    return renderedHtml;

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usualy i use “-lmarkdown” flag to compile it (for discount shared library). but in Qt i dont know how.
i tried

QMAKE_LFLAGS += -lmarkdown

QMAKE_LFLAGS += -lmarkdown

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and

unix|win32: LIBS += -lmarkdown

unix|win32: LIBS += -lmarkdown

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but didn’t work.
any help?