Hi Li, I had the same issue. The cmake output actually tells you what it needs :) you need to install *flex*. Not sure if *apt install flex* is enough or do you need to install something like libflex-dev, as well. Best regards, Stanisław Gepner, Ph.D. *Faculty of Power and Aeronautical Engineering* Nowowiejska 21/25 Str. 00-665 Warsaw, Poland phone +48 (22) 234 51 70 <https://www.pw.edu.pl/engpw> On 03.02.2021 03:55, 朝黎明 wrote:

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Dear all,

I am a beginner of Nektar++. I prepared to install the Nektar++ at Ubuntu 18.04. However, some problem have occurred when I installed the source package. When running the "ccmake ..", a Cmake error happened where it said "cannot build scotch". Actually, I have install the scotch lib. I have attached the screenshot, would anyone give me any suggestions?

With best wishes!

Li-Ming

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