想要使用leptonica编写一个图像处理程序，或者调用leptonica/prog下例子程序，出现类似错误：
leptTest ./test Error in pixReadStreamJpeg: function not present Error in pixReadStream: jpeg: no pix returned Error in pixRead: pix not read Error in pixGetDimensions: pix not defined Error in pixSaveTiledOutline: pixs not defined Error in pixContrastNorm: pixs undefined or not 8 bpp Time: Contrast norm: 0.000 Mpix/sec Error in pixSaveTiledOutline: pixs not defined Error in pixWrite: pix not defined
重新执行./configure，发现
checking for png_read_png in -lpng... no checking for jpeg_read_scanlines in -ljpeg... no checking for DGifOpenFileHandle in -lgif... no checking for TIFFOpen in -ltiff... no checking for WebPGetInfo in -lwebp... no checking for opj_create_decompress in -lopenjp2... no
解决办法，
./configure LDFLAGS=-L/usr/local/lib/ CFLAGS=-I/usr/local/include/
这时就会显示
checking for png_read_png in -lpng... yes checking for jpeg_read_scanlines in -ljpeg... yes checking for DGifOpenFileHandle in -lgif... no checking for TIFFOpen in -ltiff... yes