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I need to compile and install libnettle 3.7 on Ubuntu 20.04.3 LTS. I need it to compile and install GnuTls 3.7 and libfilezilla 0.35 and FileZilla 3.57. So, I downloaded nettle-3.7.3.tar.gz. Configure, make and install. And just to be sure

sudo ldconfig /usr/local/lib64/

Bu when I configure GnuTLS from sources gnutls-3.7.2.tar.xz I get

checking for NETTLE... no
configure: error: 
  ***
  *** Libnettle 3.6 was not found.

What am I doing wrong? Is it possible to install it on Ubuntu 20.04?

Answering to @steeldriver

There are two files in /usr/local/lib64/pkconfig: hogweed.pc and nettle.pc.

PKG_CONFIG_PATH=/usr/local/lib64/pkgconfig/ pkg-config --cflags --libs nettle returns:

-I/usr/local/include -L/usr/local/lib64 -lnettle

BTW Synaptic shows that libnettle 3.5.1 is installed.

Robert Drygas
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    Unless you modified the ./configure PREFIX, then it looks like nettle installs everything in /usr/local - in particular, the .pc file goes in /usr/local/lib64/pkgconfig/. What does PKG_CONFIG_PATH=/usr/local/lib64/pkgconfig/ pkg-config --cflags --libs nettle return? – steeldriver Dec 16 '21 at 21:53

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