When centos uses source code compilation to install tesseract, three 
dependent packages are missing, but these three dependent packages have 
been installed and the versions fully meet the requirements.
the details:
configure: WARNING: icu 52.1 or higher is required, but was not found.
configure: WARNING: Training tools WILL NOT be built.
configure: WARNING: Try to install libicu-dev package.
checking for pango... no
configure: WARNING: pango 1.38.0 or higher is required, but was not found.
configure: WARNING: Training tools WILL NOT be built.
configure: WARNING: Try to install libpango1.0-dev package.
checking for cairo... no
configure: WARNING: Training tools WILL NOT be built because of missing 
cairo library.
configure: WARNING: Try to install libcairo-dev?? package.


I tried: both tesseract5.3.0 and tesseract4.1.0 have this warning

the version of three dependent packages in my current centos environment:
# rpm -q libicu pango cairo
libicu-60.3-2.1.al8.x86_64
pango-1.48.7-3.0.1.al8.x86_64
cairo-1.17.4-7.al8.x86_64

thanks for your replies

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