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Bug 3941

Summary: SDL2_image sqrtf missing when building with SVG support on Linux
Product: SDL_image Reporter: Luke A. Guest <laguest>
Component: miscAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: unspecified   
Hardware: x86_64   
OS: Linux   

Description Luke A. Guest 2017-11-04 11:44:55 UTC 
/bin/sh ./libtool  --tag=CC   --mode=link gcc  -I/usr/include/libpng16  -g -O2 -D_REENTRANT -I/usr/include/SDL2   -o showimage showimage.o libSDL2_image.la -lSDL2
libtool: link: gcc -I/usr/include/libpng16 -g -O2 -D_REENTRANT -I/usr/include/SDL2 -o showimage showimage.o  ./.libs/libSDL2_image.a -lSDL2
/home/laguest/opt/free-ada-6.4.0/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../x86_64-pc-linux-gnu/bin/ld: ./.libs/libSDL2_image.a(IMG_svg.o): undefined reference to symbol 'sqrtf@@GLIBC_2.2.5'
/lib64/libm.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make: *** [Makefile:550: showimage] Error 1

This fixes it for me:

LDFLAGS=-lm ../../SDL2_image-2.0.2/configure
Comment 1 Sam Lantinga 2017-11-05 05:00:02 UTC 
Fixed!
You can get the fixed version from http://hg.libsdl.org/SDL_image using Mercurial, and it requires the latest SDL snapshot:
http://www.libsdl.org/tmp/SDL-2.0.zip

Thanks!