Compatibility with Leptonica 1.73 #205
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http://www.leptonica.org/source/version-notes.html: Naming changes (to avoid collisions): #defines MALLOC --> LEPT_MALLOC, CALLOC --> LEPT_CALLOC, etc. ByteBuffer --> L_ByteBuffer Introduction of the TESSERACT_LIBLEPT_PREREQ macro allows backward compatibility with Leptonica <1.73.
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Compatibility with Leptonica 1.73
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…73-compat Compatibility with Leptonica 1.73
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CALLOC and FREE were renamed to LEPT_*
The alternative to using the TESSERACT_LIBLEPT_PREREQ macro introduced in this pull request, to define CALLOC and FREE to their new names, would be to depend on Leptonica >=1.73 and use the LEPT_* variants in Tesseract's code directly.
I opted for this pull request's approach for better backward compatibility.
See-Also: https://bugs.gentoo.org/show_bug.cgi?id=573382