pkg-config --exists librtmp||echo no 顯示 no 說明pkg-config 沒有找到相應的 librtmp.pc

問題是librtmp自動生成的/MinGW/lib/pkgconfig/librtmp.pc 檔案格式有問題
原文是
prefix=/mingw
exec_prefix=${prefix}
libdir=/mingw/lib
incdir=${prefix}/include

Name: librtmp
Description: RTMP implementation
Version: v2.4
Requires: libssl,libcrypto
URL: http://rtmpdump.mplayerhq.hu
Libs: -L${libdir} 
 
[email protected]@ -lrtmp -lz -lssl -lcrypto
Libs.private: -lws2_32 -lwinmm -lgdi32 
Cflags: -I${incdir} [email protected]@

修改成
prefix=/mingw
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: librtmp
Description: RTMP implementation
URL: http://rtmpdump.mplayerhq.hu
Version: v2.4
Requires.private:
Libs: -L${libdir} 
 
[email protected]@ -lrtmp 
Libs.private: -lws2_32 -lwinmm -lgdi32 -lm
Cflags: -I${includedir}
修改之後
pkg-config --exists librtmp||echo no 就不顯示 no