Source: exiv2
Version: 0.25-3.1
Severity: serious
Tags: patch
Justification: FTBFS

I am unable to rebuild exiv2 0.26 in experimental. The build fails on
dh_auto_configure. It turns out CMakeLists.txt tries to parse
g++ -dumpversion as a two component value but we currently get a single one:
$ g++ -dumpversion
7

This patch fixes the issue for me:
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -83,9 +83,8 @@ IF( MINGW OR UNIX )
     execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE 
GCC_VERSION)
     string(REGEX MATCHALL "[0-9]+" GCC_VERSION_COMPONENTS ${GCC_VERSION})
     list(GET GCC_VERSION_COMPONENTS 0 GCC_MAJOR)
-    list(GET GCC_VERSION_COMPONENTS 1 GCC_MINOR)

-    message(STATUS Compiler: ${COMPILER} " Major:" ${GCC_MAJOR} " Minor:" 
${GCC_MINOR})
+    message(STATUS Compiler: ${COMPILER} " Major:" ${GCC_MAJOR} " Full version 
string:" ${GCC_VERSION})

     IF ( CYGWIN OR ( ${GCC_MAJOR} GREATER 5 ))
         ADD_DEFINITIONS( -std=gnu++98 ) # to support snprintf

But then I get another error due to missing symbols in 
debian/libexiv2-26.symbols.
But this is already tracked in #870873.

-- System Information:
Debian Release: buster/sid
  APT prefers oldoldstable
  APT policy: (500, 'oldoldstable'), (500, 'unstable'), (500, 'testing'), (500, 
'stable'), (500, 'oldstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.12.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), 
LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

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