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diff -ur cfitsio-3.47/configure cfitsio-3.47.soname/configure
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--- cfitsio-3.47/configure	2019-08-01 15:59:50.735018203 +0200
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+++ cfitsio-3.47.soname/configure	2019-08-01 16:04:16.277042668 +0200
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@@ -2293,7 +2293,7 @@
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 CFITSIO_MINOR=47
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 # Increment soname each time the interface changes:
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-CFITSIO_SONAME=8
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+CFITSIO_SONAME=7
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 #--------------------------------------------------------------------
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diff -ur cfitsio-3.47/configure.in cfitsio-3.47.soname/configure.in
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--- cfitsio-3.47/configure.in	2019-05-21 21:42:37.000000000 +0200
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+++ cfitsio-3.47.soname/configure.in	2019-08-01 16:03:15.723124934 +0200
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@@ -17,7 +17,7 @@
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 AC_SUBST(CFITSIO_MAJOR,3)
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 AC_SUBST(CFITSIO_MINOR,47)
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 # Increment soname each time the interface changes:
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-AC_SUBST(CFITSIO_SONAME,8)
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+AC_SUBST(CFITSIO_SONAME,7)
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 #--------------------------------------------------------------------
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 # Command options
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diff -ur cfitsio-3.47/fitsio.h cfitsio-3.47.soname/fitsio.h
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--- cfitsio-3.47/fitsio.h	2019-05-08 17:34:50.000000000 +0200
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+++ cfitsio-3.47.soname/fitsio.h	2019-08-01 16:05:22.684049113 +0200
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@@ -37,7 +37,7 @@
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 #define CFITSIO_VERSION 3.47
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 #define CFITSIO_MINOR 47
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 #define CFITSIO_MAJOR 3
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-#define CFITSIO_SONAME 8
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+#define CFITSIO_SONAME 7
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 /* the SONAME is incremented in a new release if the binary shared */
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 /* library (on linux and Mac systems) is not backward compatible */