python - 在make调用期间make无法找到OpenCV库

我正在尝试从github存储库make一个C++程序。我已经克隆了回购协议(protocol)，并将其放入CD。按照说明，我运行make进行构建。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

运行它时，出现以下错误:

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路径到opencv，以反射(reflect)我在计算机上安装的位置。我在这里安装了它(并在python中经常使用):Users/asi/anaconda3/pkgs/libopencv-3.4.2-h7c891bd_1/include/opencv2这样，我创建了一个新的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

我不确定该怎么办。我在-I调用引用的路径中安装了所有库。为什么make找不到它们？
作为引用，我在Mac(Catalina OS)上运行。

最佳答案

自制或多或少始终将其安装的所有二进制文件符号链接(symbolic link):

/usr/local/Cellar/PACKAGENAME/PACKAGEVERSION

至

/usr/local/bin

因此您只需要在PATH上添加/usr/local/bin即可获得所有自酿软件包的最新二进制文件。因此，让我们看一下我用自制安装的pdfimages:

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

和中的所有库

/usr/local/lib

因此您通常只需要编译以下内容:

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

如果失败，只需使用find查找您的库，然后相应地设置-L XXX:

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

另外，您可以按照与here.所述完全相同的方式使用pkgconfig

关于python - 在make调用期间make无法找到OpenCV库，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/63746424/