python - make 在 make 调用期间找不到 OpenCV 库

Question

我正在尝试 make来自 github 存储库的 C++ 程序。我已经将 repo 和 cd 克隆到其中。根据说明，我运行 make build 。这是原始的Makefile:

# Makefile for heartbeat
appname := Heartbeat

CXX := g++
RM := rm -f
CXXFLAGS := -Wall -g -std=c++11 -I/usr/local/include/opencv4
LDFLAGS := -g
LDLIBS := -lopencv_core -lopencv_dnn -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_objdetect -lopencv_video -lopencv_videoio

SRCS := $(shell find . -name "*.cpp")
OBJS = $(subst .cpp,.o,$(SRCS))

all: $(appname)

$(appname): $(OBJS)
    $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $(appname) $(OBJS) $(LDLIBS)

depend: .depend

.depend: $(SRCS)
    $(RM) ./.depend
    $(CXX) $(CXXFLAGS) -MM $^>>./.depend;

clean:
    $(RM) $(appname) $(OBJS)

dist-clean: clean
    $(RM) *~ .depend

include .depend

当我运行它时，我得到这个错误:

g++ -Wall -g -std=c++11 -I/usr/local/include/opencv4 -g -o Heartbeat ./RPPG.o ./Heartbeat.o ./opencv.o -lopencv_core -lopencv_dnn -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lobjdetect -lopencv_video -lopencv_videoio
ld: library not found for -lopencv_core
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Heartbeat] Error 1

所以我调整了 -I include path to opencv 以反射(reflect)我在我的机器上安装它的位置。我在这里安装了它(并在 python 中经常使用它):Users/asi/anaconda3/pkgs/libopencv-3.4.2-h7c891bd_1/include/opencv2有了这个，我制作了一个新的 Makefile:

# Makefile for heartbeat
appname := Heartbeat

CXX := g++
RM := rm -f
CXXFLAGS := -Wall -g -std=c++11 -I/Users/asi/anaconda3/pkgs/libopencv-3.4.2-h7c891bd_1/include
LDFLAGS := -g
LDLIBS := -lopencv_core -lopencv_dnn -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lobjdetect -lopencv_video -lopencv_videoio

SRCS := $(shell find . -name "*.cpp")
OBJS = $(subst .cpp,.o,$(SRCS))

all: $(appname)

$(appname): $(OBJS)
        $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $(appname) $(OBJS) $(LDLIBS)

depend: .depend

.depend: $(SRCS)
        $(RM) ./.depend
        $(CXX) $(CXXFLAGS) -MM $^>>./.depend;

clean:
        $(RM) $(appname) $(OBJS)

dist-clean: clean
        $(RM) *~ .depend

include .depend

但我仍然收到此错误:

g++ -Wall -g -std=c++11 -I/Users/asi/anaconda3/pkgs/libopencv-3.4.2-h7c891bd_1/include   -c -o Heartbeat.o Heartbeat.cpp
g++ -Wall -g -std=c++11 -I/Users/asi/anaconda3/pkgs/libopencv-3.4.2-h7c891bd_1/include   -c -o opencv.o opencv.cpp
g++ -Wall -g -std=c++11 -I/Users/asi/anaconda3/pkgs/libopencv-3.4.2-h7c891bd_1/include -g -o Heartbeat ./RPPG.o ./Heartbeat.o ./opencv.o -lopencv_core -lopencv_dnn -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lobjdetect -lopencv_video -lopencv_videoio
ld: library not found for -lopencv_core
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Heartbeat] Error 1

我不知道该怎么办。我将所有库都安装在我的 -I 调用引用的路径中。为什么不能make找到他们？
作为引用，我在 Mac(Catalina OS)上运行。

Answer 1

自制 或多或少总是符号链接(symbolic link)它安装的所有二进制文件:

/usr/local/Cellar/PACKAGENAME/PACKAGEVERSION

到

/usr/local/bin

所以你只需要/usr/local/bin在您的 PATH 上，您将获得所有 的最新二进制文件自制 包。那么，让我们看看pdfimages我用 安装的自制 :

ls -l /usr/local/bin/pdfimages
lrwxr-xr-x   1 mark  admin        38 Jul 14 15:54 pdfimages -> ../Cellar/poppler/0.90.1/bin/pdfimages

同样，它将所有头文件放入

/usr/local/include

和所有图书馆

/usr/local/lib

所以您通常只需要以下内容即可编译:

g++ -std=c++XX source.cpp -I /usr/local/include -L /usr/local/lib -lXXX -lYYY -lZZZ -o program

如果做不到这一点，只需使用 find 查找您的库然后设置-L XXX因此:

# Look for OpenCV libraries in /usr, /opt and $HOME
find /usr /opt $HOME -type f -iname "*opencv*so" 2> /dev/null

或者，您可以使用 pkgconfig与 here. 描述的方式完全相同