Experimental Physics and
Industrial Control System

> So I confirmed the location of libX11.a and  copied this file( /usr/lib/arm-linux-gnueabihf/libX11.a ) to  /home/pi/epics/base-3.15.8/lib/linux-arm/.

That is definitely not the right way to do it.

In epics/extensions/configure/os you need to edit the correct CONFIG_SITE.* file to define the location of X11. For example CONFIG_SITE.linux-x86_64.linux-x86_64 on my system contains these lines:

X11_LIB=/usr/lib64
X11_INC=/usr/include

# OpenMotif location
MOTIF_LIB=/usr/lib64
MOTIF_INC=/usr/include

You need to define the X11_LIB and X11_INC directories for your system.

But I am not sure that will fix your problem.  Do you only have the static library /usr/lib/arm-linux-gnueabihf/libX11.a, or do you also have the dynamic library libX11.so?  If you do have the libX11.so file, then please send the output of this command:

ldd libX11.so

Mark

________________________________
From: Huyn Woo Ryu <acoustic2000 at gmail.com>
Sent: Tuesday, April 27, 2021 7:19 PM
To: Mark Rivers
Cc: tech-talk at aps.anl.gov
Subject: Re: how to install alh on raspberry pi 4

Hi, Mark
Thank you for your reply

Before this error occurred, I had the below error.

make -C O.linux-arm -f ../Makefile TOP=../../.. \
    T_A=linux-arm install
make[1]: Entering directory '/home/pi/epics/extensions/src/alh1_2_35/O.linux-arm'
make[1]: *** No rule to make target '../../../lib/linux-arm/libX11.a', needed by 'alh'.  Stop.
make[1]: Leaving directory '/home/pi/epics/extensions/src/alh1_2_35/O.linux-arm'
make: *** [../../../base/configure/RULES_ARCHS:58: install.linux-arm] Error 2

So I confirmed the location of libX11.a and  copied this file( /usr/lib/arm-linux-gnueabihf/libX11.a ) to  /home/pi/epics/base-3.15.8/lib/linux-arm/.

pi@raspberrypi:~/epics/extensions/src/alh1_2_35 $ locate libX11.a
/usr/lib/arm-linux-gnueabihf/libX11.a




On Tue, Apr 27, 2021 at 8:42 PM Mark Rivers <rivers at cars.uchicago.edu<mailto:rivers at cars.uchicago.edu>> wrote:
Hi Ryu,

I have not worked with linux-arm, so I may be off base.

Error messages like this:
/usr/bin/ld: /home/pi/epics/base-3.15.8/lib/linux-arm/libX11.a(CrGlCur.o): undefined reference to symbol 'dlopen@@GLIBC_2.4'

often mean that the version of gcc (which supplies GLBIC) is older than the version required by a library you are using.

 Where did you get this file?   /home/pi/epics/base-3.15.8/lib/linux-arm/libX11.a

That seems like an unusual location for the X11 library file.

Mark



From: Tech-talk <tech-talk-bounces at aps.anl.gov<mailto:tech-talk-bounces at aps.anl.gov>> on behalf of Huyn Woo Ryu via Tech-talk <tech-talk at aps.anl.gov<mailto:tech-talk at aps.anl.gov>>
Sent: Tuesday, April 27, 2021 4:51 AM
To: tech-talk at aps.anl.gov<mailto:tech-talk at aps.anl.gov>
Subject: how to install alh on raspberry pi 4


 Hi,I installed base-3.15.8 successfully on raspberry piBut when I install 'alh1_2_35' on raspberry pi OS(kernel version 5.10) on raspberry pi 4, it can't make successfully, the err as follows:
/usr/bin/ld: /home/pi/epics/base-3.15.8/lib/linux-arm/libX11.a(CrGlCur.o): undefined reference to symbol 'dlopen@@GLIBC_2.4'
/usr/bin/ld: //lib/arm-linux-gnueabihf/libdl.so.2: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[1]: *** [../../../../base/configure/RULES_BUILD:204: alh] Error 1
make[1]: Leaving directory '/home/pi/epics/extensions/src/alh1_2_35/O.linux-arm'
make: *** [../../../base/configure/RULES_ARCHS:58: install.linux-arm] Error 2   I don't know how to fix it, could you give me some advice on it?Please, Help me! I consumed many time for this problem.Ryu